*I lost my concentration,' Jitendra said, shaking his head. *Should have switched to a different attack plan when I had the window. Still, it's not all bad news. A draw gives me enough points to retain my ranking, whereas they needed a win not to go down the toilet.' He worked his shoulders, as if both his arms had popped out of their sockets and needed to be relocated. *And I don't think the damage is as bad as it looked out there.'

*Nothing that can't be welded back together,' Sunday said.

*One good thing came out of it,' Jitendra said, before burying his face in a warm wet towel.

*Which was?' Sunday asked.

*Eight, fifteen, seventeen.' He gave them both a grin. *I figured that bit out, anyway. And I was right. Those numbers do mean something to me.'

When they were back at the apartment, Sunday and her brother prepared a simple meal, and they shared another bottle of wine, one which Geoffrey had insisted on buying by way of celebration for a successful day. They dined with Toumani Diabate providing kora accompaniment. The recording was a hundred years old, made when the revered musician was a very elderly man, yet it remained as bright and dazzling as sunglints on water.

When the dishes had been cleared and the wine glasses refilled, she knew that the time had come to invoke the construct. This was the crux, she felt certain. If Eunice could offer no guidance on the matter, then all they had was a dirty old glove and some cheap plastic jewels. And with the possibility of mystery safely banished from their lives, they could all return to their mundane concerns.

*Good evening, Sunday,' Eunice said, speaking Swahili. *Good evening, Jitendra. Good evening, Geoffrey.'

*Good evening, Eunice,' they chorused.

*How are you enjoying your stay?' Eunice asked, pointedly directing her question at Geoffrey.

*Very much, thank you,' he said, but with an edge of nervousness, as if he did not quite trust that Eunice's working memory had been scrubbed after their last exchange. *Sunday and Jitendra are first-rate hosts.'

*Excellent. I trust that the remainder of your visit will be just as enjoyable.' She turned her imperious regard onto Sunday. *May I be of assistance?'

*We have a question,' Sunday said.

*If it's about the glove, I'm afraid I have told you all that I am able to.'

*It's not exactly about the glove. Well, it sort of is, but we have something different to ask you now.' Sunday looked at Jitendra, inviting him to speak.

*I discovered a pattern,' Jitendra said. *Three numbers. They relate to Pythagoras.'

*Where was this pattern?' Eunice queried sharply, as if addressing a small boy who had mumbled something out of turn in class.

*There were gemstones in the glove,' Jitendra said, *red, green and blue ones. The numbers form a Pythagorean triple: eight, fifteen, seventeen.'

*I see.'

*It took me a while to make the connection,' Jitendra went on. *It was almost there, but I couldn't quite bring it out. Then I saw the Meta Presence logo on the side of the other robot . . . the triangle . . . and it was like a key turning in my head. It wasn't a Pythagorean triangle, of course, but it was enough.'

*Question is, why Pythagoras?' Sunday asked. *Could mean several things. But seeing as we're on the Moon, and seeing as there's a good chance that glove came from a Moon suit . . . I wondered if it might have something to do with Pythagoras itself.' She swallowed and added, *As in the crater, on the Earth-facing side.'

Eunice cogitated for many agonising seconds, her expression perfectly unchanging. Sunday had taken pains to imbue the construct with Eunice's own speech patterns and mannerisms, and this kind of hiatus was one of them.

*Something did happen to me there,' she said, breaking her own silence. *Systems failure, coming in to land at the Chinese station in Anaximenes. Lost thrust authority and hard-landed in Pythagoras.' She smacked her fist into her palm, making a loud, meaty clap. *Ship was toast, but I managed to suit-up and bail out before she lost hull pressure. Chinese knew where I'd come down. Problem was, their one rover was out on an excursion and if I sat tight waiting for them to get a rescue party to me, I'd be toast as well. My only option was to walk, and try to meet them two-thirds of the way, on the other side of the crater wall. So that's what I did: I walked a actually hopped, most of the way a and climbed, and I was down to three hours of useful consumables when I saw their rover cresting the horizon.' She shrugged, profoundly unimpressed by her own story. *It was a close thing, but there were close things all the time in those days.'

*So that's it?' Sunday said, doubtfully. *That's all that ever happened to you in Pythagoras?'

*If you would rather I hadn't made it, dear child, then I can only apologise.'

*I didn't mean to downplay what happened,' Sunday said. *It's just, well, another Eunice story. In any other life it would be the most amazing thing, but in yours . . . it's not even a chapter. Just an anecdote.'

*I have had my share of adventure,' Eunice conceded.

*When did this happen?' Jitendra asked.

*The year would have been . . .' Eunice made a show of remembering. *Fifty-nine, I believe. Back when Jonathan and I were still married. It was a different Moon then, of course. Still a wilderness, in many respects. A lot changed in the next two or three decades. That was why we decided to move on again.'

*To Mars. With the Indians,' Sunday said. *But even Mars wasn't enough of a wilderness to keep you happy.'

*Living out the rest of his life there suited Jonathan. Didn't suit me. I came back to the Moon eventually, but only when the rest of the system had exhausted its ability to astonish.'

*I'm surprised you didn't come all the way back, to Africa,' Geoffrey said.

*And cripple myself under a gee of gravity again? I'd barely set foot on Earth in forty years, boy. I missed the household; I missed the acacia trees and the sunsets. But I did not miss the crush of all that dumb matter under my feet, pinning me to the earth under a sky that felt like a heavy blanket on a warm night.' She jabbed a finger against the side of her head. *Space changed me; I could never go home again. Space will do that to you. If that bothers you, best stay home.'

*Excuse me for having an opinion,' Geoffrey said.

She eyed him, then nodded once. Eunice had always placed a much higher premium on those who dared to stand up to the monstrous force of her personality than those who gave in without a fight.

*I should not blame you for living later than I did,' Eunice said, adopting a tone that was as close to conciliatory as she ever got. *You did not choose to be born in this century, any more than I chose to be born in mine.'

*And that was a long time ago,' Jitendra said.

*You think so?' the construct replied. *There are rocks out there, still sitting on the Lunar surface, that haven't moved since the Late Heavy Bombardment.'

*She might be right,' Sunday said. *If Eunice crashed somewhere out of the way like Pythagoras, there's a good chance her tracks are still there, from the landing site all the way out of the crater, to wherever the Chinese rescued her.'

*Just so long as Pythagoras hasn't been chewed over for water or helium,' Jitendra said. *Or had casinos plastered all over it.'

*The Chinese station at Anaximenes was a supply point for their hydroxyl mining and refining operations around the north pole,' Eunice said, tapping her instantaneous knowledge base. *Once the pipelines were in and extraction became automated, there was no need to keep all the crewed stations open. There's no longer a human presence in Anaximenes, and the last person to set foot in Pythagoras was me.' She paused, catching herself before anyone else had a chance to speak. *Actually, I lie: a recovery team flew in to strip the ship for anything salvageable a 'tronics, fuel, shielding. They were Indian, and under space law they had the right to fillet the wreck. But that was only a few weeks later and they wouldn't have touched most of the evidence.'

*Evidence,' Geoffrey said. *It's like we're already talking about a crime scene.'

*Maybe we're making a bit too much of it,' Sunday said. *If the glove was meant to lead us to the crater, why didn't it just come with a handy little map tucked into it?'

*A test of your ability to draw the necessary conclusion from the clues, perhaps?' Eunice suggested.

*Well, good luck,' Geoffrey said. *I'll be deeply interested to hear what, if anything, you find out there.'

*We're all in this together, brother,' Sunday said.

*Speak for yourself. All I've done is examine a glove at the request of the family.'

Sunday turned back to the construct. *Thank you for your time, Eunice a you've been most helpful.'

*It's over,' Geoffrey said, when the figment had vanished. *There's no mystery. No reason not to come clean about the glove, and the gemstones.'

Sunday shrugged and decided, possibly with the assistance of mild intoxication, that she would call his bluff. *Fine. Call the cousins. Tell them what you found.'

*They still think the glove's in Copetown.'

*Say you went back and got it. It'll only be a white lie.'

Jitendra sucked air through his teeth. *Beginning to wish I hadn't been so clever after all.'

*It's all right,' Sunday said. *This is just a brother-and-sister thing.'

*What Sunday doesn't grasp,' Geoffrey said, *is that there's more at stake to me personally than the reputation of Eunice, or the family business.'

*You think you're the only one with responsibilities?'

*I have to put the elephants first, and that means keeping the cousins happy. So I'll take the glove back to Earth, and declare the contents to customs.'

Sunday said nothing. She knew when her brother still had more to get off his chest.

*But I won't tell the cousins about the mathematical pattern. They can work that out for themselves, if they're bright enough. And I won't tell them what Eunice just told us either.'

*They're not fools,' Sunday said.

*It's a compromise. You and Jitendra can keep digging into this little treasure hunt, if you wish. The cousins don't need to know about that. Mainly they'll be relieved that there wasn't anything obvious and incriminating in the vault. Now they can go back to their polo with a clear conscience.'

*At least we agree on one thing,' Sunday said. *Neither of us likes the cousins very much.'

*They're Akinyas,' Geoffrey said. *I think that says it all.'

CHAPTER SIX.

In the morning he found Sunday in her studio. She had already been busy and industrious a she always had been a morning person. There was fresh bread and milk, the smell of powerful coffee permeating the apartment.

*It's very nice,' he said, admiring the piece she was working on. It was some kind of half-scale Maasai-looking figure study: a skeletal stick-thin figure with a spear. Sunday was using a power tool to chisel away at the blade-edge of a cheekbone, biting her tongue in fierce concentration.

*It's shit, actually. Commissioned work. I'm doing two of them, to flank the doorway of an ethnic restaurant in the third cavern.' She wore a long skirt, a black T-shirt and a red headscarf. Power tools, dappled with dried white specks, dangled from a belt hanging low around her hips. *What pays the rent around here, not digging into the past of a dead ancestor.'

*It's still art.'

*That's one point of view.'

*You don't think so?'

*They wanted something African. I said, you're going to have to narrow it down a bit: are we talking west coast, east coast, are we even sub-Saharan? But no, they said, we want to keep it less specific than that.'

*Like you say, it pays the rent.'

*Guess I shouldn't complain. Picasso drew on napkins to pay his bar tabs. And if this goes in on time, there may be more work when they open another concession across town.' She hooked the power tool back into its loop and unbuckled the belt, draping it onto one of her paint-and-plaster-spattered work surfaces. *You're up, anyway. You want breakfast? I thought we'd hit the zoo today.'

*I just grabbed some bread,' Geoffrey said. *Where's Jitendra?'

*Asleep. Does all his best thinking unconscious.' She pottered over to a bowl and dipped her hands in water before drying them on her skirt. *Hope that wasn't too heavy, all that business last night.'

*Anything to do with family is bound to err on the heavy side.' Geoffrey looked down, realising he'd trodden in something wet and sticky. *Look, I meant to say a it was absolutely wrong of me not to tell you straight away what I was doing up here, but I felt I was in a bind. If you can forgive me-'

*I already have. This one time.' She finished drying her fingers, leaving dark ovals on the skirt. *But listen a you and me, we have to be open with each other. Always used to be, didn't we? You and me against the household, from the moment we worked out how to make nuisances of ourselves. How dear Memphis didn't strangle us, I won't ever know.'

*Different back then, though. Being rebellious didn't cost us anything except maybe being banished to our bedrooms before supper. Now we've got people and things that depend on us.'

*Doesn't mean we can't be honest with each other, though, does it?'

*The cousins didn't want you to know. They'll spit teeth if they find out I told you.'

Sunday moved the sculpture by its base and positioned it under a cluster of blue-tinged lights. *Then we'd better make damn sure they don't.'

Children flew kites and balloons in the park. Others were preoccupied with enormous dragon-like flying contraptions not much smaller than the Cessna, the chief function of which appeared to be battling with other dragon-like flying contraptions. They had glittering foil plumage, bannered tails and marvellous anatomically precise wings that beat the air with the awesome slowness of a whale's heart. Elsewhere there were amorous couples, outbreaks of public theatre or oratory, ice-cream stands, puppet shows and a great many fabulously costumed stilt-walkers. Geoffrey stared in wonder at an astonishingly beautiful stilt-walking girl covered with leaves and green face paint, like a tree spirit made carnal.

*Do you think,' Sunday asked, *that the cousins had any idea what you might find in the bank?'

*If they did, they hid it well.'

*Big risk, though, sending you up to look into the vault.'

*Less of a risk than bringing an outsider into it.' He tongued the ice cream Sunday had bought him from one of the stands. *Ideally, Hector and Lucas would have come up here in person, but then people would have started wondering why they needed to visit the Moon. Before you know it, the whole system would be poking its nose into Akinya business.'

*You think Memphis knows about the vault?'

*If he does, he's said nothing to me.' Geoffrey dripped some of the ice cream onto his sleeve. He lifted the fabric to his mouth and licked off the spillage. *Still, he knows something's going on. I'm not sure what the rest of the family make of my absence, but Memphis knows I've gone to the Moon.'

*Memphis had more contact with Eunice near the end than any of us.'

*She might have told him things then, I suppose,' Geoffrey said. *Or at any point during the exile. She was up here for more than sixty years.'

*Maybe the simplest thing would be to ask him directly, in that case. See if he knows anything about the glove and the gemstones, and a possible connection to Pythagoras.'

*If you'd like me to.'

They navigated the edge of a small civic pond where children splashed in the shallows and little pastel-sailed boats bobbed and battled further out. On the far bank, Geoffrey caught the flash of something small and mammalian emerging from the water before vanishing immediately into tufts of grass. An otter, or maybe a rat, its fur silvery with water.

*You're not at all curious about any of this, are you?' Sunday said, not bothering to hide her disapproval. *When you head home to Africa, it's straight back to your old life.'

*You say that like it's a bad thing.'

*Just do that one thing for me a find out what Memphis knows.'

*Look, before you dig any deeper into this a are you absolutely sure this is something you really want to mess with? You won't be able to do a five-minute scrub on your own working memory.'