The Burroughs j.a.panese filed out of the car, and Maya clicked off her lectern and followed. The station was only a small tent, south of Fournier Crater; its interior was simple, a T-shaped dome. Scores of people wandered the three levels of the interior, in groups or singly, most of them in plain work jumpers, but many in business suits or metanational uniforms, or in casual clothes, which these days consisted of loose pantaloons, blouses, and moccasins.

Maya found the sight of so many people a bit alarming, and she moved awkwardly past the kiosk lines and the crowded cafes fronting the pistes. No one met the eye of such a bald withered androgyne. Feeling the artificial breeze on her scalp, she took her place at the front of the line to get on the next train south, turning over in her mind the photo from the book. Had they ever really been that young?

At one o'clock the train floated in from the north. Security guards came out of a room by the cafes, and under their bored eye she put her wrist to a portable checker, and boarded. A new procedure, and simple; but as she found a seat her heart was racing. Clearly the Sabishiians, with the help of the Swiss, had beaten the Transitional Authority's new security system. But still she had reason to be afraid- she was Maya Toitovna, one of the most famous women in history, one of the most wanted criminals on Mars, with the pa.s.sengers in their seats looking up at her as she pa.s.sed down the aisle, naked under a blue cotton jumper.

Naked but invisible, by reason of unsightliness. And the truth was that at least half the occupants of the car looked as old as her, Mars vets who looked seventy and could have been twice that, wrinkled, gray-haired, balding, irradiated and bespectacled, scattered among all the tall fresh young natives like autumn leaves among evergreens. And there among them, what looked like Spencer Jackson. As she flung her bag onto the overhead rack, she looked at the seat three ahead; the man's bald pate told her little, but she was pretty sure it was him. Bad luck. On general principle the First Hundred (the First Thirty-nine) tried never to travel together. But there was always the chance that chance itself would screw them up.

She sat in the window seat, wondering what Spencer was doing. Last she had heard, he and Sax had formed a technological team in Vishniac mohole, doing weapons research that they weren't telling anyone else about, or so Vlad had said. So he was part of Sax's crazy outlaw ecotage team, at least to some extent. It didn't seem like him, and she wondered if he had been the moderating influence one recently noticed in Sax's activities. Was h.e.l.las his destination, or was he returning to the southern sanctuaries? Well- she wouldn't find out until h.e.l.las at best, as the protocol was to ignore each other until they were in private.

So she ignored Spencer, if it was him, and she ignored the pa.s.sengers still filing into the car. The seat next to her remained empty. Across from her were two fiftyish men in suits, emigrants by the look of them, apparently traveling with the two just like them who were seated in front of her. As the train pulled out of the station tent they discussed some game they had all played together: "He hit it a mile! He was lucky to ever find it again!" Golf, apparently. Americans, or something like. Metanational executives, off to oversee something in h.e.l.las, they didn't mention what. Maya took out her lectern and headphones and put the headphones on. She called up Novy Pravda Novy Pravda and watched the tiny images from Moscow. It was hard to concentrate on the voices, and it made her drowsy. The train flew south. The reporter was deploring the growing conflict between Armscor and Subarashii over the terms of the Siberian development plan. This was a case of crocodile tears, as the Russian government had been hoping for years to play the two giants off against each other and create an auction situation for the Siberian oil fields, rather than be met by a united metanat front dictating all terms. It was surprising in fact that the two metanats had broken ranks like this. Maya did not expect that it would last; it was in the metanats' interest to hold together, to make sure it was always a matter of parceling out the available resources and never fighting for them. If they squabbled, the fragile balance of power might collapse on them, a possibility of which they were surely aware. and watched the tiny images from Moscow. It was hard to concentrate on the voices, and it made her drowsy. The train flew south. The reporter was deploring the growing conflict between Armscor and Subarashii over the terms of the Siberian development plan. This was a case of crocodile tears, as the Russian government had been hoping for years to play the two giants off against each other and create an auction situation for the Siberian oil fields, rather than be met by a united metanat front dictating all terms. It was surprising in fact that the two metanats had broken ranks like this. Maya did not expect that it would last; it was in the metanats' interest to hold together, to make sure it was always a matter of parceling out the available resources and never fighting for them. If they squabbled, the fragile balance of power might collapse on them, a possibility of which they were surely aware.

She put her head back drowsily and looked out the window at the pa.s.sing land. Now they were gliding down into the lapygia Sink, and had a long view to the southwest. It looked like the Siberian taiga/tundra border, as depicted on the news program she had just been watching- a great frost-fractured jumble of a slope, all caked with snow and ice, the bare rock coated with lichen and amorphous mounds of olive and khaki mosses, the coral cacti and dwarf trees filling every low hollow. Pingoes dotting one flat low valley looked like a rash of acne, smeared with a dirty ointment. Maya dozed for a while.

The image of Frank at twenty-three jerked her awake. She thought drowsily about what she had read, trying to piece it together. The father; what had made him join Alcoholics Anonymous three times, and quit it twice (or three times)? It had a bad sound. And after that, as if in response to it, the kind of workaholic habits that were just like the Frank she had known, even if the work seemed un-Frankishly idealistic. Social justice was not something that the Frank she had known had believed in. He had been a political pessimist, engaged in a constant rearguard action to keep the worse from coming to the worst. A career of damage control- and, if some were to be believed, personal aggrandizement. No doubt true. Although Maya felt he had always craved power in order to effect more damage control. But no one could tease the strands of those two motives apart; they were tangled like the moss and the rock out there in the Sink. Power was a many-faceted thing.

If only Frank hadn't killed John.... She stared at the lectern, turned it on, tapped in John's name. The bibliography was endless. She checked: 5,146 entries. And it was a selected list. Frank had had several hundred at most. She switched to index mode, and looked up "Death of."

Scores of entries, hundreds! Cold and yet sweating, Maya ran swiftly down the list. The Bern connection, the Moslem Brotherhood, Marsfirst, UNOMA, Frank, her, Helmut Bronski, Sax, Samantha; by t.i.tle alone she could see that all theories of agency in his death would be advocated. Of course. Conspiracy theory was tremendously popular, always and forever. People wanted such catastrophes to mean something more than mere individual madness, and so the hunt was on.

Disgust at the crackpot inclusiveness of the list almost caused her to shut the file. But then again, perhaps she was just afraid? She opened one of the many biographies, and there on the screen was a photo of John. A ghost of her old pain pa.s.sed through her, leaving a kind of bleached, emotionless desolation. She clicked to the final chapter.

The Nicosia riot was an early manifestation of the tensions informing Martian society which would later explode in 2061. There were already a great number of Arab technicians living in minimal housing arrangements, in close proximity to ethnic groups with whom they had historical grievances, also to administration personnel whose better housing and travel and walker privileges were obvious. A volatile mix of several groups descended on Nicosia for its dedicatory celebration, and for several days the town was extremely crowded.

click click The violence has never been satisfactorily explained. Jensen's theory, that the intra-Arab conflict, stimulated by the Lebanese war of liberation from Syria, sparked the Nicosia riot, is insufficient; there were also doc.u.mented attacks on the Swiss, as well as a high level of random violence, all impossible to explain in terms of the Arab conflict alone.

The official depositions of the people in Nicosia that night still leave the ignition of the conflict a mystery. A number of reports suggest the presence of an agent provocateur agent provocateur, never identified.

click click At midnight, when the timeslip began, Saxifrage Russell was at a cafe midtown, Samantha Hoyle was on a tour of the city wall, and Frank Chalmers and Maya Toitovna had met in the western park where the speeches had been given a few hours before. Fighting had already broken out in the medina. John Boone went down the central boulevard to investigate the disturbance, as did Sax Russell from another direction. At approximately ten minutes into the timeslip, Boone was set upon by a group of between three and six young men, sometimes identified as "Arab." Boone was knocked down and whisked into the medina before any witnesses could react, and an impromptu search turned up no sign of him. It was not until 12:27 A.M. that he was located by a larger search party in the town's farm, and taken from there to the nearest hospital, on Boulevard of the Cypresses. Russell, Chalmers, and Toitovna helped to carry him- Again a disturbance in the car drew Maya out of the text. Her skin was clammy, and she was shivering slightly. Some memories never really went away, no matter how you suppressed them: despite herself Maya remembered perfectly the gla.s.s on the street, a figure on its back on the gra.s.s, the puzzled look on Frank's face, the so different puzzlement on John's.

But those were officials, there at the front of the car, standing in the aisle and moving slowly down it. Checking IDs, travel doc.u.mentation; and there were another two stationed at the back of the car.

Maya tapped off her lectern. She watched the three policemen move down the car, feeling her pulse knocking hard through her body. This was new; she had never seen it before, and it seemed the others on board hadn't either. The car was hushed; everyone watched. Anyone in the car could have had irregular ID, and that fact made for a kind of solidarity in their silence; all eyes focused on the police; no one looked around to see who might be blanching.

The three policemen were oblivious to this observation, and almost seemed oblivious to the very people they interviewed. They joked among themselves as they discussed the restaurants of Odessa, and they moved from row to row rapidly, like conductors, gesturing for people to put their wrists up to the little reader, then cursorily checking the results, comparing for only a few seconds people's faces to the photos called up by their IDs.

They came to Spencer, and Maya's heart rate picked up. Spencer (if it was Spencer) merely held up a steady hand to the reader, apparently looking straight at the seat back in front of him. Suddenly something about his hand was deeply familiar- there under the veins and the liver spots was Spencer Jackson, no doubt of it. She knew it by the bones. He was answering a question now, in a low voice. The policeman with the voice-and-eye reader held it to Spencer's face briefly, and then they all waited. Finally they got a quick line on the reader, and moved on. Two away from Maya. Even the exuberant businessmen were subdued, eyeing each other with sardonic grimaces and raised eyebrows, as if it were ludicrous to have such measures imported into the cars themselves. No one liked this; it was a mistake to do it. Maya took heart from that, and looked out the window. They were ascending the southern side of the Sink, the train gliding up the gentle grade of the piste over low hills, each higher than the next, the train always moving at the same speed, as if moving by magic carpet, over the even-more-magic carpet of the millefleur landscape.

They stood over her. The one closest wore a belt over his rust uniform jumper, with several instruments hanging from the belt, including a stun gun. "ID wrist please." He wore an ID tag, with photo and dosimeter, and a label that said "United Nations Transitional Authority." A thin-faced young emigrant of about twenty-five, though it was easier to guess that from the photo than the face itself, which looked tired. The man turned and said to the woman officer behind him, "I like the veal parmesan they do there."

The reader was warm on her wrist. The woman officer was observing her closely. Maya ignored the look and stared at her wrist, wishing she had a weapon. Then she was looking into the camera eye of the voice-and-eye reader. "What is your destination?" the young man asked.

"Odessa."

A moment's suspended silence.

Then a high beep. "Enjoy your stay." And they were off.

Maya tried to regulate her breathing, to slow it down. The wrist readers took pulses, and if you were over 110 or so they notified the applicator; it was a basic lie detector in that sense. Apparently she had stayed under the line. But her voice, her retinas; those had never been changed. The Swiss pa.s.sport ident.i.ty must be powerful indeed, overriding the earlier IDs when they were consulted, at least in this security system. Had the Swiss done that, or the Sabishiians, or Coyote, or Sax, or some force she didn't know? Had she actually been successfully identified and let go, to be tracked so that she would lead them to more of the fugitive Hundred? It seemed as likely as the idea of overmastering the big data banks- as likely or more.

But for the moment, she was left alone. The police were gone. Maya's finger knocked on the lectern, and without thinking about it she called back what she had been reading. Michel was right; she felt tough and hard, diving back into this stuff. Theories to explain the death of John Boone. John had been killed, and now she was being checked by police while traveling over Mars in an ordinary train. It was hard not to feel that there was some sort of cause and effect there, that if John had lived, it wouldn't be this way.

All the princ.i.p.al figures in Nicosia that night have been accused of being behind the a.s.sa.s.sination: Russell and Hoyle on the basis of sharp disagreements in Marsfirst policy; Toitovna on the basis of a lovers' quarrel; and the various ethnic or national groups in town on the basis of political quarrels either real or imaginary. But certainly the most suspicion over the years has fallen on the figure of Frank Chalmers. Though he was observed to be with Toitovna at the time of the attack (which in some theories gets Toitovna called an accessory or coconspirator), his relationship with the Egyptians and Saudis in Nicosia that night, and his long-standing conflict with Boone, make it inevitable that he is often identified as the ultimate cause of Boone's murder. Few if any deny that Selim el-Hayil was the leader of the three Arabs who eventually confessed before their suicide/murders. But this only adds to suspicion of Chalmers, as he was a known acquaintance of el-Hayil's. Samizdat and one-read doc.u.ments are reputed to tell the story that "the stowaway" was in Nicosia, and spotted Chalmers and el-Hayil in conversation that night. As "the stowaway" is a myth mechanism by which people convey the anonymous perceptions of the common Martian, it is quite possible that such a tale expresses the observations of people who did not want to be identified as witnesses.

Maya clicked to the end.

El-Hayil was in the late stages of a fatal paroxysm when he broke into the hotel occupied by the Egyptians and confessed to the murder of Boone, a.s.serting that he had been the leader, but had been aided by Rashid Abou and Buland Besseisso of the Ahad wing of the Moslem Brotherhood. The bodies of Abou and Besseisso were found later that afternoon in a room in the medina, poisoned by coagulants that appeared to be self-administered or given to each other. The actual murderers of Boone were dead. Why they acted, and with whom they may have acted, will never be known. Not the first time such a situation has existed, and not the last; for we hide as much as we seek.

Scrolling through footnotes, Maya was struck again by what a Topic this was, debated by historians and scholars and conspiracy nuts of every persuasion. With a shudder of revulsion she tapped the lectern off, and faced the double window and shut her eyes hard, trying to restore the Frank she had known, and the Boone. For years she had scarcely ever thought of John, the pain was so great; and in a different way she hadn't wanted to think of Frank either. Now she wanted them back. The pain had become the ghost of pain, and she needed to have them back, for her own life's sake. She needed to know.

The "mythical" stowaway... She ground her teeth, feeling the weightless hallucinatory fear of that first sight of him, his brown face distorted and big-eyed through the gla.s.s... did he know anything? Had he really been in Nicosia? Desmond Hawkins, the stowaway, the Coyote- he was a strange man. Maya had her own particular relationship with him, but she doubted whether he would tell her much about that night.

What is it? she had asked Frank when they heard the shouting.

A hard shrug, a look away. Something done on the spur of the moment. Where had she heard that before? He had looked away as he said it, as if he could not bear her gaze. As if he had somehow said too much.

The mountain ranges ringing the h.e.l.las Basin were widest in the western crescent called the h.e.l.lespontus Montes, the range on Mars most reminiscent of Terran mountains. To the north, where the piste from Sabishii and Burroughs crossed into the basin, the range was narrower and lower, not so much a matter of mountainous terrain as of an uneven drop to the basin floor, the land seemingly shoved to the north in low concentric waves. The piste threaded its way down this hilly slope, and often it had to switch-back down long ramps cut into the sides of the rock waves, each new one lower than the last. The train slowed greatly for the turns, and for many minutes at a time Maya could look out her window either straight at the bare basalt of the wave they were descending, or out over a big expanse of northwest h.e.l.las, still three thousand meters below them: a wide flat plain, ochre and olive and khaki in the foreground, then, out on the horizon, a dirty jumble of white, winking like a broken mirror. That was the glacier over Low Point, still mostly frozen, but thawing more each year, with melt ponds on its surface, and deeper pods of water far below- pods which teemed with life, and occasionally broke onto the surface of the ice, or even the adjacent land- for this lobe of ice was growing fast. They were pumping water out of aquifers below the surrounding mountains onto the basin floor. The deep depression in the northwest part of the basin, where Low Point and the mohole had been, was the center of this new sea, which was over a thousand kilometers long, and at its widest, over Low Point, three hundred kilometers across. And situated in the lowest point on Mars. A situation rich with promise, as Maya had been maintaining from the very moment they had landed.

The town Odessa had been established well up the north slope of the basin, at the-1-kilometer elevation, where they planned to stabilize the final level of the sea. Thus it was a harbor town waiting for water, and with that in mind the southern edge of the town was a long boardwalk or corniche, a wide gra.s.sy esplanade that ran inside the tent, which was secured in the edge of a tall seawall that now stood above bare land. The view of the seawall as the train approached gave one the impression that it was a half-town, with a southern part that had been split off and disappeared.

Then the train was coasting into the town's train station, and the view was cut off. The train stopped and Maya pulled down her bag and walked out, following Spencer. They did not look at each other, but once out of the station they went with a loose group of people to a tram stop, and got on the same little blue tram, which ran behind the corniche park bordering the seawall. Near the west end of town they both got off at the same stop.

There, behind and above an open-air market shaded by plane trees, was a three-story apartment complex inside a walled courtyard, with young cypresses lining the side walls. Each floor of the building stepped back from the one below, so that there were balconies for the two higher levels, sporting potted trees and flower boxes hung on their railings. As she climbed the stairs up to the gate of the courtyard, Maya found the architecture of the building somewhat reminiscent of Nadia's buried arcades; but up here in the late afternoon sun behind the market, its walls whitewashed and its shutters blue, it had the look of the Mediterranean or the Black Sea- not all that unlike some fashionable seaside apartment blocks in Terra's Odessa. At the gate she turned to look back over the plane trees of the market; the sun was setting over the h.e.l.lespontus Mountains to the west, and out on the distant ice, blinks of sunlight gleamed as yellow as b.u.t.ter.

She followed Spencer through the garden and into the building, checked in with the concierge right after he did, got her key, and went to the apartment that had been a.s.signed to her. The whole building belonged to Praxis, and some apartments functioned as safe houses, including hers, and no doubt Spencer's. They got in the elevator together and went to the third floor, not speaking. Maya's apartment was four doors down from Spencer's. She went inside. Two s.p.a.cious rooms, one with a kitchen nook; a bathroom, an empty balcony. The view from the kitchen window overlooked the balcony, and the distant ice.

She put her bag on the bed and went back out, down to the market to buy dinner. She bought from vendors with carts and umbrellas, and sat on a bench placed on the gra.s.s bordering the corniche, eating souvlakia and drinking from a little bottle of retsina, watching the evening crowd make their leisurely promenade up and down the corniche. The closest edge of the ice sea looked to be about forty kilometers away, and now all but the easternmost part of the ice was in the shadow of the h.e.l.lespontus, a dusky blue shading in the east to alpenglow pink.

Spencer sat down beside her on the bench. "Nice view," he remarked.

She nodded and continued eating. She offered him the bottle of retsina, and he said, "No thank you," holding up a half-eaten tamale. She nodded and swallowed.

"What are you working on?" she asked when she was done.

"Parts for Sax. Bioceramics, among other things."

"For Biotique?"

"For a sister company. She Makes Seash.e.l.ls."

"What?"

"It's the name of the company. Another Praxis division."

"Speaking of Praxis..." She glanced at him.

"Yes. Sax wants these parts pretty bad."

"For weapons?"

"Yes."

She shook her head. "Can you keep him on a leash for a while?"

"I can try."

They watched the sunlight drain out of the sky, flowing westward like a liquid. Behind them lights flicked on in the trees over the market, and the air began to chill. Maya felt grateful that there was an old friend sitting beside her, in comfortable silence. Spencer's behavior toward her made a telling contrast to Sax; in his friendliness was his apology for his recriminations in the car after Kasei Vallis, and his forgiveness for what she had done to Phyllis. She appreciated it. And in any case he was one of the primal family, and it was nice to have that during yet another move. A new start, a new city, a new life- how many was it now?

"Did you know Frank very well?" she said.

"Not really. Not like you and John knew him."

"Do you think... do you think he could have been involved in John's murder?"

Spencer continued to look out at the blue ice on the black horizon. Finally he took the retsina bottle from the bench beside her, drank. He looked at her. "Does it matter anymore?"

She had spent many of the early years working in the h.e.l.las Basin, convinced as she had been that its low elevation was going to make it an obvious site for settlement. Now the land just above the-1-kilometer contour was being settled in places all around the basin, places she had been among the first to explore. She had her old notes on them in her AI, and now, as Ludmilla Novosibirskaya, she got to put them to use.

Her job was in the administration of the hydrological company that was flooding the basin. The team was part of a conglomerate of organizations developing the basin, among them the Black Sea Economic Group's oil companies, the Russian company that had tried to resuscitate the Caspian and Aral seas, and her company, Deep Waters, which was Praxis-owned. Maya's job involved coordinating the many hydrological operations in the region, so again she got to see the heart of the h.e.l.las project, just as in the old days when she had been the driving force behind the entire thing. This was satisfying in various ways, some of them strange- for instance her town Low Point (a mistaken siting, she had to admit) was out there getting drowned deeper every day. That was fine: drown the past, drown the past, drown the past....

So she had her work, and her apartment, which she filled with used furniture and hanging kitchen implements and potted plants. And Odessa proved to be a pleasant town. It was built princ.i.p.ally of yellow stone and brown tile, and placed on a part of the slope of the basin rim that curved inward more than usual, so that every part of town looked down on the center of the dry waterfront, and every part had a great view over the basin to the south. The lower districts were devoted to shops and business and parks, the higher ones to residential neighborhoods and garden strips. The town lay just above 30 lat.i.tude in the south, and so she had gone from autumn to spring, with the big hot sun shining down the stepped streets of the upper town, and melting away the winter's snow from the ice ma.s.s's edge, and the peaks of the h.e.l.lespontus Mountains on their western horizon. A handsome little town.

And about a month after her arrival, Michel came down from Sabishii, and took over the apartment right next door to hers. At her suggestion he installed a connecting door between their two living rooms, and after that they wandered between the two apartments as if in one, living their lives in a conjugal domesticity which Maya had never experienced before, a normality that she found very restful. She did not love Michel pa.s.sionately, but he was a good friend, a good lover, and a good therapist, and having him around was like having an anchor inside her, keeping her from flying away into exhilarations of hydrology or revolutionary fervor, also from sinking too deep into terrible abysses of political despair or personal repugnance. Cycling up and down the sine wave of her moods was a helpless oscillation that she hated, and anything Michel did in the way of amplitude modulation she appreciated. They kept no mirrors in the apartments, which along with clomipramine helped to dampen the cycle. But the bottoms of pots, and the windows at night, gave her the bad news if she cared to have it. As often enough she did.

With Spencer down the hall, the building had just the slightest feeling of Underhill to it, reinforced occasionally by visitors from out of town, using their apartment in its capacity as safe house. When others of the First Hundred came through, they would go out and walk the waterless waterfront, looking at the ice horizon and exchanging the news like old folks anywhere. Marsfirst, led by Kasei and Dao, was becoming more and more radical. Peter was working on the elevator, drawn like a moth back to its moon. Sax had stopped his mad ecotage campaign for the time being, thank G.o.d, and was concentrating on his industrial effort in Vishniac mohole, building surface-to-s.p.a.ce missiles and the like. Maya shook her head at this news. It was not military might that would do it for them; on that issue she sided with Nadia and Nirgal and Art. They would need something else, something she could not yet visualize. And this gap in her thinking was one of the things that would start her downward in the sine wave of her moods, one of the things that made her mad.

Her work coordinating the various aspects of the flooding project began to get interesting. She trammed or walked down to the offices in the center of town, and there worked hard to process all the reports sent in by the many dowsing crews and drilling operations- all full of glowing estimates of the amounts of water they might put into the basin, and all accompanied by requests for more equipment and personnel, until altogether they added up to much more than Deep Waters could supply. Judging the competing claims was difficult from the office, and her technical staff usually just rolled their eyes and shrugged. "It's like judging a liars' contest," one said.

And then also reports were coming in from all around the basin of the new settlements under construction, and by no means all of the people building these settlements came from the Black Sea Group, or the metanats involved with them. A lot of them were simply unidentified- one of her dowsing crews would note the presence of a tent town which had no official existence, and leave it at that. And the two big canyon projects, in Dao Vallis and the Dao-Reull system, were clearly populated by many more people than could be accounted for in the official doc.u.mentation- people who must therefore be living under a.s.sumed ident.i.ties, like her, or else living out of the net entirely. Which was very interesting indeed.

A circ.u.mh.e.l.las piste had just been completed the year before, a difficult piece of engineering as the rim of the basin was riven by cracks and ridges, and cratered by a heavy dose of ejecta reentry. But now the piste was in place, and Maya decided to satisfy her curiosity by taking a trip out to inspect all the Deep Waters projects in person, and look into some of the new settlements.

To accompany her on this trip she requested the company of one of their areologists, a young woman named Diana, whose reports had been coming in from the east basin. Her reports were terse and unremarkable, but Maya had learned from Michel that she was the child of Esther's son, Paul. Esther had had Paul very soon after leaving Zygote, and as far as Maya knew, she had never told anyone who Paul's father was. So it could have been Esther's husband Kasei, in which case Diana was Jackie's niece, and John and Hiroko's great-granddaughter- or else it could have been Peter, as many supposed, in which case she was Jackie's half-niece, and Ann and Simon's great-granddaughter. Either way Maya found it intriguing, and in any case the young woman was one of the yonsei, a fourth-generation Martian, and as such interesting to Maya no matter what her ancestry.

Interesting also in her own right, as it turned out when Maya met her in the Odessa offices a few days before their trip. With her great size (over two meters tall, and yet very rounded and muscular) and her fluid grace, and her high-cheekboned Asiatic features, she seemed a member of a new race, there to keep Maya company in this new corner of the world.

It turned out that Diana was completely obsessed with the h.e.l.las Basin and its hidden water, and she talked about it for hours, at such length and in such detail that Maya became convinced that the mystery of parentage was solved- such a marsmaniac must be related to Ann Clayborne, and so it followed that Paul had been fathered by Peter. Maya sat in the train seat beside the big young woman, watching her or looking out the window at the steep northern slope of the basin, asking questions, observing as Diana shifted her knees against the seat back in front of her. They did not make train seats big enough for the natives.

One thing that fascinated Diana was that the h.e.l.las Basin had proved to be ringed by much more underground water than had been predicted by the areological models. This discovery, made in the field over the last decade, had inspired the current h.e.l.las project, turning the hypothetical sea from a nice idea into a tangible possibility. It had also forced the areologists to reconsider their theoretical models of early Martian history, and caused people to start looking around the rims of the other big impact basins on the planet; reconnaissance expeditions were under way in the Charitum and Nereidum Montes encircling Argyre, and in the hills ringing south Isidis.

Around h.e.l.las itself they were near to completing the inventory, and they had found perhaps thirty million cubic meters all told, though some dowsers argued they were by no means finished. "Is there a way to know when they're finished?" Maya asked Diana, thinking about all the requests for resources flooding her office.

Diana shrugged. "After a while you've just looked everywhere."

"What about the basin floor itself? Might the flooding be destroying our ability to get to some aquifers out there?"

"No." Almost no water, she told Maya, was located under the basin floor itself. The floor had been desiccated by the original impact, and now it consisted of about a kilometer's depth of eolian sediment, underlain by a hard cake of brecciated rock, formed during the brief but stupendous pressures of the impact. These same pressures had also caused deep fracturing all around the rim of the basin, and it was this fracturing that had allowed unusually large amounts of outga.s.sing from the interior of the planet. Volatiles from below had seeped up and cooled, and the water portion of the volatiles had pooled in liquid aquifers, and in many zones of highly saturated permafrost.

"Quite an impact," Maya observed.

"It was big all right." As a general rule, Diana said, impactors were about one-tenth the size of the crater or basin they made (like historical figures, Maya thought); so the impacting planetesimal in this case had been a body about two hundred kilometers in diameter, coming down on ancient cratered highland terrain. Signature traces of it indicated it had probably been an ordinary asteroid, carbonaceous chondrite for the most part, with lots of water and some nickel-iron in it. It had had a speed on arrival of about 72,000 kilometers per hour, and had hit at a slightly eastward angle, which explained the huge devastated region east of h.e.l.las, as well as the high, relatively well-organized concentric ridges of the h.e.l.lespontus Montes to the west.

Then Diana described another rule of thumb which caused Maya to free-a.s.sociate a.n.a.logies to human history: the bigger an impactor, the less of it survived the impact. Thus almost every bit of this one had vaporized in the cataclysmic strike- though there was a small gravitational bolide under Gledhill Crater, which some areologists claimed was almost certainly the buried remainder of the planetesimal, perhaps one ten-thousandth of the original or less, which they claimed would supply all the iron and nickel that they would ever need if they cared to go digging for it.

"Is that feasible?" Maya asked.

"Not really. Cheaper just to mine the asteroids."

Which they were doing, Maya thought darkly. That was what a prison sentence meant now, under the latest UNTA regime- years in the asteroid belt, operating the very strictly circ.u.mscribed mining ships and robots. Efficient, the Transitional Authority said. Prisons that were both remote and profitable.

But Diana was still thinking about the basin's awesome birth. The impact had occurred about three and a half billion years before the present, when the planet's lithosphere had been thinner, and its interior hotter. Energies released by the impact were hard to imagine: the total energy created by humanity through all history was as nothing to it. And so the resulting volcanic activity had been considerable. Surrounding h.e.l.las were a number of ancient volcanoes, which just postdated the impact, including Australis Tholus to the southwest, Amphitrites Patera to the south, and Hadriaca Patera and Tyrrhena Patera to the northeast. All of these volcanic regions had been found to have liquid water aquifers near them.

Two of these aquifers had burst onto the surface in ancient times, leaving on the eastern slope of the basin two characteristic sinuous water-carved valleys: Dao Vallis, originating on the corrugated slopes of Hadriaca Patera; and farther south, a linked pair of valleys known as the Harmakhis-Reull system, which extended for a full thousand kilometers. The aquifers at the heads of these valleys had refilled over the eons since their outbreaks, and now big construction crews had tented Dao and were working on Harmakhis-Reull, and were letting the water from the aquifers run down the long enclosed canyons, to outlets on the basin floor. Maya was extremely interested in these big new additions to the habitable surface, and Diana, who knew them well, was going to take her to visit some friends in Dao.

Their train glided along the northern rim of h.e.l.las for all the first day, with the ice in view on the basin floor almost continually. They pa.s.sed a little hillside town called Sebastopol, its stone walls Florentine yellow in the afternoon, and after that came to h.e.l.l's Gate, the town at the bottom end of Dao Vallis. They walked out of the h.e.l.l's Gate train station late in the afternoon, and looked down into a big new tent town, located under an enormous suspension bridge. The bridge supported the train piste, spanning Dao Vallis just up from the canyon's mouth, so that its towers were over ten kilometers apart. From the canyon rim by the bridge, where the train station was, they could see down the widening mouth of the canyon onto the basin floor, stretching out under a lattice of kinky sun-stained clouds. In the other direction there was a view well up into the steep narrow world of the canyon proper. As they walked down a staired and switchbacked street into the town, the new tenting over the canyon was visible only as a certain red haze to the color of the evening sky, the result of a dusting of fines on the tenting materials. "We'll go upstream tomorrow by way of the rim road," Diana said, "and get an overview. Then come back down on the canyon floor, so you can see what it's like down there."

They descended the street, which had 700 numbered steps. In h.e.l.l's Gate's downtown they walked around and had dinner, and then climbed back up to the Deep Waters office, which was on the valley wall just under the bridge. They stayed in rooms there, and next morning went to a garage by the train station and borrowed a small company rover.

Diana took the wheel and drove them northeast, paralleling the canyon rim on a road that ran next to the ma.s.sive concrete foundation for the canyon's tenting. Even though the fabrics were diaphanous to the point of vanishing, the sheer size of the roof made it a heavy weight to anchor. The concrete bulk of the foundation blocked their view down into the canyon itself, so that when they came to the first overlook, Maya had not seen into it since h.e.l.l's Gate. Diana drove into a little parking lot up on the broad foundation itself, and they parked and put on helmets and got out of the car, and walked up a wooden staircase that seemed to ascend freestanding into the sky, although a closer look revealed first the clear aerogel beam supporting the staircase, and then the layers of tenting, stretching away from their beam to others that could not be seen. At the top of the stairs was a small railed viewing platform, with a prospect that gave a view of the canyon for many kilometers both upstream and downstream.

And there was indeed a stream; the floor of Dao Vallis had a river in it. The canyon floor was dotted with green, or to be more precise, a collection of greens. Maya identified tamarisk, cottonwood, aspen, cypress, sycamore, scrub oak, snow bamboo, sage- and then, on the steep talus and boulder slopes footing the canyon walls, many varieties of shrubs and low creepers, and of course sedge, and moss, and lichen. And running through this exquisite arboretum, a river.

It was not a blue stream with white rapids. The water in the slower stretches was opaque, and the color of rust. In the rapids and waterfalls it foamed bright shades of pink. Cla.s.sic Martian tones, caused, Diana said, by the fines that were suspended in the water like glacial silt- also by the reflected color of the sky, which was today a kind of hazy mauve, going lavender around the veiled sun, as yellow as the iris of a tiger's eye.

But no matter the color of the water- it was a running river, in an obviously riverine valley, placid in some places, agitated in others, with gravel fords, sandbars, braided sections, crumbling lemniscate islands, there a big deep lazy oxbow, frequent rapids, and far upstream, a couple of small falls. Under the tallest waterfall they could see the pink foam turn almost white, and patches of white were then carried downstream, to catch on boulders and snags sticking out from the bank.

"Dao River," Diana said. "Also called the Ruby River by the people who live down there."

"How many are there?"

"A few thousand. Most live pretty close to h.e.l.l's Gate. Upstream there are family homesteads and the like. And of course then the aquifer station at the head of the canyon, where a few hundred of them work."

"It's one of the biggest aquifers?"

"Yes. About three million cubic meters of water. So we're pumping it out at a flow rate- well, you see it there. About a hundred thousand cubic meters a year."

"So in thirty years, no more river?"

"Right. Although they could pump some water back upstream in a pipe, and let it out again. Or who knows, if the atmosphere gets humid enough, the slopes of Hadriaca might collect a snow-pack big enough to serve as a watershed. Then the river would fluctuate with the seasons, but that's what rivers do, don't they."