"That would be lovely," Sundaram mused. "If we could get to know them - an enlightenment -"

Nansen dismissed that idea at the formal meeting several days later. "We are pledged to go to the Yonderfolk," he said starkly.

"But the science to do," Mokoena demurred. "A whole new biology."

"The beings," Sundaram added in his quiet fashion. "Their thoughts, feelings, arts, their mysterious history."

"I know," Nansen replied. "But you know, all of us know, we could spend our lives here and not begin to understand it. We're in search of a starfaring race. I only agreed to this diversion because it might somehow bear on" - he faltered -"on certain questions about the stability of high technology."

"Well, doesn't it?" Cleland made bold to ask.

"Yes and no," Nansen said to the half-circle he faced. "Clearly, they never achieved the zero-zero drive. It does appear their time of glory was long ago. Perhaps the civilization we are bound for did not yet exist. Perhaps the haze in this cluster prevented their finding traces of any farther off. It was discoveries like that which led us to the principles of the quantum gate."

"Somebody had to do it first, independently," Kilbirnie argued. "I suspect we would have regardless."

Nansen shrugged. "Who can say? In any event, I have had a few thoughts about the situation here and how it came to be. I've discussed them with Engineer Yu and Physicist Dayan, who carried them further. We have what we believe is a reasonable hypothesis."

Brent glanced at Yu, Kilbirnie at Dayan, with a flash of jealousy. Kilbirnie lost hers in fascination as talk continued.

"A high technology, including nucleonics and doubtless genetic engineering, arose on this planet, and evidently there was world peace, too," Nansen said. "Perhaps there always was. They explored the planetary system. They began to use its resources: energy, minerals, industrial sites that did not harm the biosphere at home. In all this they were like us.

"Then why should they not do what our ancestors thought of doing, and would have done if zero-zero had not made it irrelevant? Send probes to the nearer stars - and in a cluster, every star is near. Robots to survey and study and beam their findings back."

"Our ancestors did, a few times," Cleland pointed out.

Nansen nodded. "True. But they never took the next step, which was to send von Neumann machines."

"What?"

Nansen looked at Dayan. "Would you like to explain?"

"It's simple enough," she said. "We use the same principle every day in our nanotech, and in fact it's the basis of life and evolution. Send machines that not only explore and report to you, but make more like themselves and dispatch those onward, programmed to do likewise."

Brent whistled. "Whew! How long would they take to eat the galaxy?"

"It wouldn't be that bad," Yu told him. "It would be enough to make a few score in any given planetary system. An asteroid or two would suffice for materials."

"A probe wouldn't be a single unit," Dayan added. "We've seen. A carrier, housing the central computer and its program; a number of robots to do the actual work, including to build the next generation of machines."

"But none ever reached us," Ruszek argued, puzzled. "Why not? If it began here, oh, a million years ago - well, we've seen what kind of boost the carriers have. Sixteen hundred light-years, they should have spread through that before now."

"High boost," Brent said, "but limited delta v." v." He had been pondering the recorded data, as well as starting to dissect the slain robots. "Maybe a fiftieth or a hundredth He had been pondering the recorded data, as well as starting to dissect the slain robots. "Maybe a fiftieth or a hundredth c." c."

"Even so -"

Zeyd narrowed his eyes. "The shipkillers," he hissed. "Can they be the reason?"

"Not that simple," Dayan answered. "Our conjecture - But, Captain, you can probably explain it with the least technicalese."

A smile tugged at Nansen's mouth. "Thank you. I'll try.

"Essentially, we think a von Neumann probe went to the double star soon after it had gone nova. We don't know if that was the most recent eruption or an earlier one, but our guess is that it was the latest. The mission was a very natural one, to a remarkable thing, fairly nearby. And doubtless the system has kept a few planets, or at least solid debris in orbit, to use for construction material.

"Now, the von Neumann principle does not mean that immediately on arrival, a machine makes more machines to launch toward farther stars. First it will make more like itself to investigate the system that it has reached. They must cope with many unforeseeables. Their hardware must be complex. But even more, they need sophisticated software, programs capable not just of learning but of developing solutions to problems that arise - and programs that can take advantage of any opportunity they see to do things better, more efficiently.

"Well, our hypothesis is that in the dreadful radiation environment shortly after the nova outburst, a program mutated. Probably several did, in different ways, and perished. It would make sense to take the useable parts of those machines for making new ones. But this mutant went beyond that. It found it could reproduce still more efficiently by actively assaulting others, or any machinery it found, and processing what it took."

"My God, a predator!" Kilbirnie blurted. She stared before her. "No awareness to tell it this was wrong, a bad idea. Evolution, blind as wi' life."

"I imagine the . . . cannibals . . . aren't too specialized," Yu murmured. "They must retain the ability to use raw materials. It is simply a loss of ... inhibition. But in the end, they devoured all others in the nova system."

"And then they went after new prey," Dayan said, flat-voiced.

"Is that why no such machines ever reached Sol?" Mokoena asked. In her expression, shock struggled with professional interest.

"No," Zeyd said. "How could they overtake the wave of exploration?"

"Wolves didn't wipe out buffalo," Brent added.

"Predator and prey developed an integral relationship," Sundaram said. "We learned on Earth how unwise it is to interfere with the web of life."

"Please," Nansen said. "These are side issues. Argue them later."

"The analogies to organic evolution are not exact," Yu admitted.

"Our guess is that machines capable enough to be useful interstellar explorers are necessarily so complex as to be vulnerable to mutation in their programs," Dayan said. "They need not visit a nova. Sooner or later, if nothing else, cosmic radiation will do it. Generally, they lose their 'wits' and just drift on aimlessly forever. Probably no line of von Neumanns gets beyond a few hundred light-years before it goes effectively extinct."

"More speculation," Nansen said. "We, our crew, will never know with certainty. But the suggestion is that this one mutation was successful in a way. And sonic of the predators came back to this star. It may have been random, or they may have . . . remembered.

"By then, the civilization here was completely dependent on its industries in space. Suddenly they were wiped out. If the beings realized what was going on and tried to launch weapons against the invaders, those weapons were inadequate, perhaps gobbled up as they left atmosphere. Or perhaps the beings were too peaceful to think of weapons. Whatever happened, their technology collapsed. It must have been horrible."

Mokoena winced. "Famines. Epidemics. Billions dying."

"They seem to have rebuilt as best they could," Nansen reminded her gently. "It looks like a stable population and ecology, a world that can last till the sun grows too hot."

Kilbirnie grimaced. "But then? And meanwhile, ne'er to adventure again?"

"Not while the predators prowl," Brent grated.

"I daresay they've reached an equilibrium, too," Dayan said. "They probably reproduce from raw materials and from the parts of ones that, um, die. Maybe they have combats once in a while, but that can't be the basis of their existence. Their programs remember, though. They remember. And when we arrived - Manna from heaven."

Zeyd jumped to his feet. "Let's hunt them down!" he shouted. "If we do nothing else, we can set these poor beings free!"

Ruszek sat bolt upright, his mustache quivering. Brent stifled a cheer.

"No," Nansen said. "It would take years, if we can do it at all. And we can't tell what the consequences could be. We are not God. We have our promise to keep.

"No, we have not really solved the mystery we found. We have what seems to be a good guess, no more. It is the best we can hope for. If no one finds an unanswerable reason to stay, we will continue on our proper mission within this week."

Zeyd snapped air into his lungs, looked around at his crewmates, and sat down. Silence closed in.

Kilbirnie waved a hand aloft. "Bravo for you, skipper!" she called. "We've plenty ahead of us. Bring us there!"

She, at least, is wholeheartedly with me, Nansen thought. Nansen thought. I'd like to confide in her I'd like to confide in her - - tell her why this irrational sense of urgency is riding me tell her why this irrational sense of urgency is riding me - - if the thing I'm afraid of turns out to be true. if the thing I'm afraid of turns out to be true.

And then, looking at her: Afraid? Why? Our mission is to discover the truth, whatever it may be. Afraid? Why? Our mission is to discover the truth, whatever it may be.

His mind flew back across light-years, to what was less knowable than that which lay ahead. May they at home still have a spirit like hers. May they at home still have a spirit like hers.

CHAPTER 17.

Earth was the mother and her Kith Town the small motherland of every starfarer; but there were other worlds where humans dwelt. At those the ships were almost always welcome, bearers of tidings and wares that bridged, however thinly, the abysses between. It was not perennially so on Earth.

Thus, over the centuries, Tau Ceti became the sun which voyagers from afar often sought first. Its Harbor was as homelike as any known extrasolar planet, and usually at peace. News beamed from Sol arrived only eleven and a half years old; if you had felt unsure, you could now lay plans. Whether or not you went on to that terminus, here was a good place to stop for a while, do business, make fresh acquaintances and breathe fresh winds. A Kith village grew up, stabilized, and settled into its own timelessness.

Spanning the distances they did, vessels could hardly ever prearrange a rendezvous. It was occasion for rejoicing and intermingling when two happened to be in the same port. When three or more did, it meant a Fair.

Fleetwing came to Harbor and found came to Harbor and found Argosy Argosy and and Eagle Eagle in orbit. in orbit. Argosy Argosy was about to depart, but immediately postponed it. Profits could wait; they were no longer large anyway. Fellowship, courtship, exchange of experiences, renewal of ties, the rites that affirmed and strengthened Kith-hood, mattered more. was about to depart, but immediately postponed it. Profits could wait; they were no longer large anyway. Fellowship, courtship, exchange of experiences, renewal of ties, the rites that affirmed and strengthened Kith-hood, mattered more.

Ormer Shaun, second mate aboard Fleetwing, Fleetwing, and Haki Tensaro, who dealt in textiles wherever and Haki Tensaro, who dealt in textiles wherever Eagle Eagle might be, walked together through the village, bound for the story circle. Tensaro wanted to hear what Shaun would tell; they had become friendly in the past few days, and besides, a real yarn-spinning with a bardic accompaniment was an art practiced in just four ships, which did not include might be, walked together through the village, bound for the story circle. Tensaro wanted to hear what Shaun would tell; they had become friendly in the past few days, and besides, a real yarn-spinning with a bardic accompaniment was an art practiced in just four ships, which did not include Eagle. Eagle. The two men had met for a beer in the Orion and Bull before starting out, and continued their conversation as they proceeded. It had gradually, unintendedly, gone from merry to earnest. The two men had met for a beer in the Orion and Bull before starting out, and continued their conversation as they proceeded. It had gradually, unintendedly, gone from merry to earnest.

"A disappointment, I admit," Shaun said. Sounds of revelry beat beneath his words. "Not so much for me, or most of our crew. But the boy, he was really looking forward to all the ancient marvels."

"We're quite safe on Earth nowadays, I tell you," Tensaro argued. "No more persecution."

"They still don't like us, though, do they? To go by what everybody's been saying."

Tensaro shrugged. "I've seen things better there, but I've seen them worse, too. I think the next generation will be pretty tolerant."

"Up to a point. I doubt we'll ever again be exactly popular anywhere on Earth outside of Kith Town."

"Why not?"

Shaun paused to marshal words. He contrasted with Tensaro, who was slim and intense, clad in formfitting lusterblack with white sash and cloak, and a headband on which a miniature light fountain made a dancing cockade. Shaun stood bigger than most Kithfolk, stocky, his features rugged and his hair a dark mahogany. For his garb today he had chosen a blouse that slowly shifted color across the visible spectrum, a vest of silver links, a broad leather belt studded with Aerian eyestones, a shaggy green kilt, and knee-length boots. A beret slanted across his brow. Both outfits were traditional festival garb, but the traditions belonged to two different ships.

"Earth doesn't have enough to do with space anymore," Shaun said. "People get in the habit of taking their ways to be the only right and decent ways. Governments feed on that. Meanwhile we insist on being peculiar, and bringing in unheard-of notions from elsewhere, and asking troublesome questions."

The street down which they passed seemed to belie him. Turf covered it, springy and pebble-grained underfoot, breathing a slight odor not unlike rosemary into cooling air. On one side a lyre tree curved its double trunk and feathery foliage aloft, on the other side an arachnea spread its web across a cloud tinted gold by the westering sun. The houses that lined the street stood each on its piece of lawn, among its flower beds. They were of archaic styles, tending to pastel walls and red-tiled roofs; time had softened their edges. All were currently vacant. Most of the families that owned them were afar among the stars, leaving machines to tend the property. Everyone staying here, whether as transients or permanently, had flocked off to the Fair.

Between the houses glimmered a glimpse of water. Beyond it the cliffs of Belderland rose white. Opposite, native forest spread red-splashed ochers and golds above the roofs. Long since deeded to the Kith, the Isle of Weyan retained much wilderness.

"Yes," Shaun said, "I think Fleetwing'll Fleetwing'll elect to make another swing from here - not as long as last time, of course, but we can give Earth forty or fifty years more to mellow further before we show our noses there again. The boy'll be disappointed, like I said. But, what the gyre, learning how to wait things out is part of becoming a Kithman." elect to make another swing from here - not as long as last time, of course, but we can give Earth forty or fifty years more to mellow further before we show our noses there again. The boy'll be disappointed, like I said. But, what the gyre, learning how to wait things out is part of becoming a Kithman."

"Well, if that's what your crew favors, so be it," Tensaro replied. "I expect you can sell what you're carrying on Aurora or Maia as well as here. It'll probably be exotic enough to fetch a price. But really, you're too pessimistic. I can understand how your last visit to Earth was embittering and made you decide on a long cruise. Nowadays, though -"

A trumpet cut him off. The noise from ahead had been waxing as they walked, voices, foot-thuds, song, boom and bang, the racket of merriment. Shaun and Tensaro came abruptly out onto open ground, where the Fair was. It surrounded the village. They had crossed from the tavern on one edge to this side.

Shaun threw up his hands. His laugh rang. "Haki, us old fools, we've gotten serious! What ails us? Did the beer wear off that fast? Come on, let's get back to our proper business today."

He quickened his pace. His comrade grinned wryly and trotted along.

People swarmed about. Folk costumes from the separate ships mingled with gaudy individual choices, often inspired on other worlds in other eras. A middle-aged couple strolled by, he in the blue-and-gold tunic and flowing white trousers, she in the red frock, saffron cloak, and massive jewelry of Eagle. Eagle. Shaun smiled at a young woman he knew aboard Shaun smiled at a young woman he knew aboard Fleetwing. Fleetwing. Her brief and gauzy gown twinkling with star points, she walked hand in hand with a young man whose fringed yellow shirt and black knee breeches said Her brief and gauzy gown twinkling with star points, she walked hand in hand with a young man whose fringed yellow shirt and black knee breeches said Argosy. Argosy. Memory stirred - courtships flowered like fire when crews met, and if the marriages that followed took place quickly, they endured, for the elders of both families had first considered what was wise. Shaun's wife was a Memory stirred - courtships flowered like fire when crews met, and if the marriages that followed took place quickly, they endured, for the elders of both families had first considered what was wise. Shaun's wife was a Flying Cloud Flying Cloud girl; but his brother had joined his own bride on girl; but his brother had joined his own bride on High Barbaree, High Barbaree, because that seemed best. . . . Children dashed about, shouting, marveling bits of rainbow. because that seemed best. . . . Children dashed about, shouting, marveling bits of rainbow.

Pavilions had been erected throughout the area, big and gaudy. Banners above them caught the sea breeze and the evening light. From one drifted savory smells and the sounds of clinking cups and cheery chatter. In another, a benched audience watched a classic drama, performed live; in another they heard a concert, which included music brought back from artists who were not all human; in another, visual artworks were on display, created aboard ship as well as on remote planets, and in this quiet atmosphere a few officers took the opportunity to discuss business or exchange information. In a clear space, a band played lustily for scores of dancers. Mirth whooped as some tried to learn, from others, measures new to them, the sarali, the Henriville, the double prance.

Nearby stood the Monument Stone. The bronze plate on it shone bright, having lately replaced a worn-out predecessor. The inscription was the same: Here camped Jean Kilbirnie and Timothy Cleland of the first expedition to Harbor, afterward of Here camped Jean Kilbirnie and Timothy Cleland of the first expedition to Harbor, afterward of Envoy Envoy and our future in the cosmos, and our future in the cosmos, with a date in a calendar long superseded. Likewise, only scholars could read the language, ancestral to Kithic, but everybody knew what it said. A few meters off, wood was heaped to be burned after dark - fire, evoking prehistoric memories and instincts older still, which were doubly strong in a people who rarely saw it. with a date in a calendar long superseded. Likewise, only scholars could read the language, ancestral to Kithic, but everybody knew what it said. A few meters off, wood was heaped to be burned after dark - fire, evoking prehistoric memories and instincts older still, which were doubly strong in a people who rarely saw it.

The narrators' pavilion lay a little distance onward. About a hundred persons sat inside waiting, mostly adults, mostly from Eagle Eagle and and Argosy, Argosy, though several youngsters and though several youngsters and Fleetwing Fleetwing crew also felt they would enjoy the performance. They gave Shaun the salute of greeting as he entered, came down an aisle, and mounted the stage. Rusa Erody was already there. She made a striking sight, clad in a long dress of scales that glittered in the subdued light, herself a genetic throwback, tall and blonde. Her fingers drew vigorous chords from the polymusicon on her lap. The song she sang was as ancient as her looks, translated and retranslated over the centuries, because it spoke to the Kith. crew also felt they would enjoy the performance. They gave Shaun the salute of greeting as he entered, came down an aisle, and mounted the stage. Rusa Erody was already there. She made a striking sight, clad in a long dress of scales that glittered in the subdued light, herself a genetic throwback, tall and blonde. Her fingers drew vigorous chords from the polymusicon on her lap. The song she sang was as ancient as her looks, translated and retranslated over the centuries, because it spoke to the Kith.

"The Lord knows what we may find, dear lass, And the Deuce knows what we may do - But we're back once more on the old trail, our own trail, the out trail, We're down, hull-down, on the Long Trail But we're back once more on the old trail, our own trail, the out trail, We're down, hull-down, on the Long Trail - - the trail that is always new!" the trail that is always new!"

Words and notes clanged away. Shaun took the chair beside hers. The tumult outside washed like surf around sudden silence.

He lifted a hand. "Good landing, friends," he drawled. A comfortable informality was his style at these events. "Thanks for coming, when you've got so much else you could be having fun with. Well, you men have had my partner to admire, Rusa Erody, biosafety technician and bard. I'm Ormer Shaun, second mate and occasional storyteller. Those of you who docked here earlier have heard others tell of things that Fleetwing Fleetwing did or encountered or got wind of, sometimes generations ago. Rusa and I will relate a happening on our latest voyage, just finished." did or encountered or got wind of, sometimes generations ago. Rusa and I will relate a happening on our latest voyage, just finished."

"But it was well-nigh a hundred years agone, for Aerie is the farthest of all worlds where humans dwell, our last lonely home in the heavens," the woman half sang. Music wove low beneath her voice. Her role was to call forth a mood and bring a scene to life. If she deemed that meant repeating common knowledge, it worked as a refrain or a familiar line of melody does. "Not even our explorers have quested much beyond, where time must sunder them from us more than the hollow spaces themselves."

Shaun frowned slightly. A storytelling was not rehearsed, but improvised. The hint that outwardness was faltering fitted ill with the lightness he intended. But Rusa generally knows what she's doing, But Rusa generally knows what she's doing, he thought. he thought. A touch of sad or anxious, like a pinch of sharp spice A touch of sad or anxious, like a pinch of sharp spice - He decided to follow suit for a moment, in prosaic wise, before he went on to his tale.

"Well, being that distant, Aerie gets visitors few and seldom. Previous one, as near as we could learn, was about a century before. We figured to do a brisk trade in the goods and information we offered.

"But also, after what we'd just been through on Earth, we didn't care to see it again soon. Insults, restrictions, place after place that didn't want us for customers, throatgrip taxes - yes, once a mob threw rocks at some of us, and I saw a woman of ours bleed and heard little children of ours crying - but many of you know this, maybe better than we do. To the Coal Sack with 'em. We'd come back after they were dead, if they hadn't meanwhile spawned too many like themselves."

A smile crinkled his face. His tone eased. "Moreover, frankly, a lot of us were curious. What'd been going on, way out at Aerie? What new and odd might we find? We'd been in the Quadrangle Trade from some while and were getting a tad bored with it. Time for a change of scene, a real change."

"The Quadrangle Trade," Erody chimed in. "Biochemicals from the seas of Maia's uninhabitable sister planet Morgana, worth harvesting and transporting because it costs more to synthesize them. Rare, useful isotopes from the system where Aurora orbits. Arts and crafts from Feng Huang. Biostock from Earth, to nourish the Earth life on yonder worlds."

This was not entirely another chorus for Shaun. Neither Eagle Eagle nor nor Argosy Argosy had plied that circuit, and crewfolk of theirs might know of it only vaguely. She did not add that it, too, was declining, losing profitability as the demand for such cargoes diminished. "We fared from the Quadrangle toward the Lion," she finished. had plied that circuit, and crewfolk of theirs might know of it only vaguely. She did not add that it, too, was declining, losing profitability as the demand for such cargoes diminished. "We fared from the Quadrangle toward the Lion," she finished.

"A long haul, aye," Shaun said. "Considering how scarce traders had been on Aerie, and how small the population and industry probably still were, we loaded a lot of stuff more massive than usual, machinery and so on."

"Besides our several hundred men, women, and children as always, their life support, their household treasures, their tools and weapons that they may have need to wield when we arrive, their need to be together, to be families, and thus keep the life of the ship alive." Not information, for those who sat listening - affirmation, for every Kith member, living, dead, and unborn.

"So our gamma factor was well down, seeing as how our quantum gate's no bigger than anybody else's."

"Not like Envoy's, Envoy's, for none of our ships is for none of our ships is Envoy, Envoy, outbound beyond the borderlands of history and bearing no more than her fabled ten. Well could we wish for an engine like hers, but the gain and loss of trade say no, it cannot pay, and though we travel not for trafficking alone, it is by the traffic that we abide as the Kith." More rituality, as a priest at a service may recite an article of the creed to strengthen feeling in a congregation that may know it word by word. outbound beyond the borderlands of history and bearing no more than her fabled ten. Well could we wish for an engine like hers, but the gain and loss of trade say no, it cannot pay, and though we travel not for trafficking alone, it is by the traffic that we abide as the Kith." More rituality, as a priest at a service may recite an article of the creed to strengthen feeling in a congregation that may know it word by word.

"Ninety-seven light-years took us eight zero-zero months. Oh, we were good and tired when we got there - tired, anyway, and cramped and grubby and ready to settle in for a while."

"Where ground and grass were under our feet, a breeze and unfeigned odors of growth in our nostrils, heaven blue overhead, and strangers around us, new souls for us to know."

"Who hadn't heard every joke and anecdote we could tell, folks who'd think we were glamorous and our wares were marvelous. And they ought to be interesting to us, of course, and have things to trade that'd fetch decent prices back at the heart stars."