How did this happen? their descendants will ask, stumbling upon the evidence, the ruins. The ruinous evidence. Who made these things? Who lived in them? Who destroyed them? The Taj Mahal, the Louvre, the Pyramids, the Empire State Building—stuff he’s seen on TV, in old books, on postcards, on Blood and Roses. Imagine coming upon them, 3-D, life-sized, with no preparation—you’d be freaked, you’d run away, and after that you’d need an explanation. At first they’ll say giants or gods, but sooner or later they’ll want to know the truth. Like him, they’ll have the curious monkey brain.

Perhaps they’ll say, These things are not real. They are phantasmagoria. They were made by dreams, and now that no one is dreaming them any longer they are crumbling away.

“Let’s suppose for the sake of argument,” said Crake one evening, “that civilization as we know it gets destroyed. Want some popcorn?”

“Is that real butter?” said Jimmy.

“Nothing but the best at Watson-Crick,” said Crake. “Once it’s flattened, it could never be rebuilt.”

“Because why? Got any salt?”

“Because all the available surface metals have already been mined,” said Crake. “Without which, no iron age, no bronze age, no age of steel, and all the rest of it. There’s metals farther down, but the advanced technology we need for extracting those would have been obliterated.”

“It could be put back together,” said Jimmy, chewing. It was so long since he’d tasted popcorn this good. “They’d still have the instructions.”

“Actually not,” said Crake. “It’s not like the wheel, it’s too complex now. Suppose the instructions survived, suppose there were any people left with the knowledge to read them. Those people would be few and far between, and they wouldn’t have the tools. Remember, no electricity. Then once those people died, that would be it. They’d have no apprentices, they’d have no successors. Want a beer?”

“Is it cold?”

“All it takes,” said Crake, “is the elimination of one generation. One generation of anything. Beetles, trees, microbes, scientists, speakers of French, whatever. Break the link in time between one generation and the next, and it’s game over forever.”

“Speaking of games,” said Jimmy, “it’s your move.”

The walking has become an obstacle course for Snowman: in several places he’s needed to make detours. Now he’s in a narrow sidestreet, choked with vines; they’ve festooned themselves across the street, from roof to roof. Through the clefts in the overhead greenery he can see a handful of vultures, circling idly in the sky. They can see him too, they have eyesight like ten magnifying glasses, those things can count the change in your pocket. He knows a thing or two about vultures. “Not yet,” he calls up at them.

But why disappoint them? If he were to stumble and fall, cut himself open, knock himself out, then be set upon by wolvogs or pigoons, what difference would it make to anyone but himself? The Crakers are doing fine, they don’t need him any more. For a while they’ll wonder where he’s gone, but he’s already provided an answer to that: he’s gone to be with Crake. He’ll become a secondary player in their mythology, such as it is—a sort of backup demiurge. He’ll be falsely remembered. He won’t be mourned.

The sun is climbing higher, intensifying its rays. He feels light-headed. A thick tendril slithers away, flickering its tongue, as his foot comes down beside it. He needs to pay more attention. Are any of the snakes venomous? Did that long tail he almost stepped on have a small furry body at the front? He didn’t see it clearly. He certainly hopes not. The claim was that all the snats had been destroyed, but it would take only one pair of them. One pair, the Adam and Eve of snats, and some weirdo with a grudge, bidding them go forth and multiply, relishing the idea of those things twirling up the drainpipes. Rats with long green scaly tails and rattlesnake fangs. He decides not to think about that.

Instead he begins to hum, to cheer himself up. What’s the song? “Winter Wonderland.” They used to recycle that in the malls every Christmas, long after the last time it snowed. Some tune about playing pranks on a snowman, before it got mushed.

Maybe he’s not the Abominable Snowman after all. Maybe he’s the other kind of snowman, the grinning dope set up as a joke and pushed down as an entertainment, his pebble smile and carrot nose an invitation to mockery and abuse. Maybe that’s the real him, the last Homo sapiens—a white illusion of a man, here today, gone tomorrow, so easily shoved over, left to melt in the sun, getting thinner and thinner until he liquefies and trickles away altogether. As Snowman is doing now. He pauses, wipes the sweat off his face, drinks half of his bottle of water. He hopes there will be more somewhere, soon.

Up ahead, the houses thin out and vanish. There’s an interval of parking lots and warehouses, then barbed wire strung between cement posts, an elaborate gate off its hinges. End of urban sprawl and pleeb city limits, beginning of Compound turfdom. Here’s the last station of the sealed-tunnel bullet train, with its plastic jungle-gym colours. No risks here, the colours are saying. Just kiddie fun.

But this is the dangerous part. Up to here he’s always had something he could climb or scramble up or dodge around in case of a flank attack, but now comes an open space with no shelter and few verticals. He pulls the sheet up over his baseball cap to protect himself from the sun’s glare, shrouding himself like an Arab, and plods on, picking up the pace as much as he can. He knows he’ll burn some even through the sheet if he stays out here long enough: his best hope is speed. He’ll need to get to shelter before noon, when the asphalt will be too hot to walk on.

Now he’s reached the Compounds. He passes the turnoff to CryoJeenyus, one of the smaller outfits: he’d like to have been a fly on the wall when the lights went out and two thousand frozen millionaires’ heads awaiting resurrection began to melt in the dark. Next comes Genie-Gnomes, with the elfin mascot popping its pointy-eared head in and out of a test tube. The neon was on, he noted: the solar hookup must still be functioning, though not perfectly. Those signs were supposed to go on only at night.

And, finally, RejoovenEsense. Where he’d made so many mistakes, misunderstood so much, gone on his last joyride. Bigger than OrganInc Farms, bigger than HelthWyzer. The biggest of them all.

He passes the first barricade with its crapped-out scopers and busted searchlights, then the checkpoint booth. A guard is lying half in, half out. Snowman isn’t too surprised by the absence of a head: in times of crisis emotions run high. He checks to see if the guy still has his spraygun, but no dice.

Next comes a tract kept free of buildings. No Man’s Land, Crake used to call it. No trees here: they’d mowed down anything you could hide behind, divided the territory into squares with lines of heat-and-motion sensors. The eerie chessboard effect is already gone; weeds are poking up like whiskers all over the flat surface. Snowman takes a few minutes to scan the field, but apart from a cluster of dark birds squabbling over some object on the ground, nothing’s moving. Then he goes forward.

Now he’s on the approach proper. Along the road is a trail of objects people must have dropped in flight, like a treasure hunt in reverse. A suitcase, a knapsack spilling out clothes and trinkets; an overnight bag, broken open, beside it a forlorn pink toothbrush. A bracelet; a woman’s hair ornament in the shape of a butterfly; a notebook, its pages soaked, the handwriting illegible.

The fugitives must have had hope, to begin with. They must have thought they’d have a use for these things later. Then they’d changed their minds and let go.