But the cables had not worked, Aenea said. They took too much maintenance to keep clear and functioning. Sudden ice storms would freeze them to the side of the slideway and someone traveling 150 klicks an hour would suddenly have their clip ring encounter immovable ice. It is hard enough these days keeping the cableway clear: the fixed lines of the slideway had been unmanageable.

So the slideways were abandoned. At least until teenagers looking for a thrill and adults in a serious hurry found that nine times out of ten, one could keep the sledfoils in the groove just by glissading—that is, by using one or more ice axes in the self-arrest position and keeping the speed low enough to stay in the trough. “Low enough” meaning beneath 150 klicks per hour. Nine times out of ten it would work. If one was very skillful. And if the conditions were perfect. And if it was daylight. A. Bettik and I had taken the slideway three other times, once returning from Phari with some medicine needed to save a young girl’s life and twice just to learn the turns and straightaways. The voyage had been exhilarating and terrifying those times, but we had made it safely. But each time had been in daylight… with no wind… and with other glissaders ahead of us, showing the way. Now it is dark; the long run gleams wickedly in the moonlight ahead of us. The surface looks iced and rough as stone. I have no idea if anyone has made the run this day… or this week… if anyone has checked for fissures, ice heaves, fractures, cave-ins, crevasses, ice spikes, or other obstacles. I do not know how long the ancient toboggan runs had been, but this slideway is more than twenty klicks long, running along the side of the sheer Abruzzi Spur connecting K’un Lun Ridge to the slopes of Hua Shan, flattening out on the gradual icefields on the west side of the Flower Mountain, kilometers south of the safer and slower Walk Way looping down from the north. From Hua Shan, it is only nine klicks and three easy cable runs to the scaffolding of Jo-kung and then a brisk walk through the fissure pass and down onto the sheer face walkways to Hsuan-k’ung Ssu. A. Bettik and I are sitting side by side like children on sleds, waiting for a push from Mommy or Daddy. I lean over, grab my friend’s shoulder, and pull him closer so that I can shout through the thermal material of his hood and face mask. The wind is stinging me with ice now. “All right if I lead?” I yell.

A. Bettik turns his face so that our cloth-covered cheeks are touching. “M. Endymion, I feel that I should lead. I have done this slideway two more times than you, sir.”

“In the dark?” I shout.

A. Bettik shakes his hooded head. “Few try it in the dark these days, M. Endymion. But I have a very good memory of every curve and straight. I believe I can be helpful in showing you the proper braking points.” I hesitate only a second.

“All right,” I say. I squeeze his hand through our gloves.

With night-vision goggles, this would be as easy as a daylight slideway glissade—which does not qualify as easy in my book. But I had lost the goggles that I had taken on my farcaster odyssey, and although the ship carried replacement pairs, I had left them in the ship. “Bring two skinsuits and rebreathers,” Rachel had relayed from Aenea. She might have mentioned night-vision goggles. Today’s jaunt was supposed to have been an easy hike to Phari Marketplace, a night spent in the hostelry there, and then a pack trip back with George Tsarong, Jigme Norbu, and a long line of porters, hauling the heavy material for the building site.

Perhaps, I think, I’m overreacting to the news of the Pax landing. Too late now. Even if we turn around, the rappel down the fixed lines on K’un Lun Ridge would be as much trouble as this glissade. Or so I lie to myself.

I watch as A. Bettik rigs his short, 38-centimeter ice-climbing hammer in the loop of the wristband on his left arm, then readies his regular 75-centimeter ice axe. Sitting cross-legged on my sled, I slip my own ice hammer into my left hand and trail my longer ice axe in my right hand like a tiller. I give the android the thumbs-up signal again and watch as he pushes off in the moonlight, spinning once, then steadying the sled expertly with his short ice hammer, chips flying, and then hurtling over the brink and out of sight for a minute. I wait until there is an interval of ten meters or so—far enough to avoid the ice spray of his passing, close enough to see him in the orange light of the Oracle—and then I push over myself. Twenty kilometers. At an average speed of 120 klicks per hour, we should cover the distance in ten minutes. Ten freezing, adrenaline-pumping, gorge-rising, terror-beating-at-the-ribs, react-in-a-microsecond-or-die minutes. A. Bettik is brilliant. He sets up each turn perfectly, coming in low for the high-banked curves so that his apogee—and mine a few seconds later—will be teetering right at the lip of the icy bank, careering out of the banked turn at just the right speed for the next descending straight, then banging and skipping down the long icy ramp so fast that vision blurs, the pounding comes up through my tailbone and spine so that vision is doubled, trebled, and my head pounds with the pain of it, then blurs again with the spray of ice chips flying, creating halos in the moonlight, bright as the unblinking stars spill and reel above us—the brilliant stars competing even with the Oracle’s glow and the asteroid moons’ quick, tumbling light—and then we are braking low and bouncing hard and riding high again, arresting into a sharp left that takes my breath away, then skidding into a sharper right, then pounding and flying down a straight so steep that the sled and I seem to be screaming into freefall. For a minute I am looking straight down at the moonlit phosgene clouds—green as mustard gas in the lying moonlight—then we are both racketing around a series of spirals, DNA-helix switchbacks, our sleds teetering on the edge of each bank so that twice my ice-axe blade bites into nothing but freezing air, but both times we drop back down and emerge—not exiting the turns so much as being spit out of them, two rifle bullets fired just above the ice—and then we bank high again, come out accelerating onto a straight, and shoot across eight kilometers of sheer ice wall on the Abruzzi Spur, the right banked wall of the slideway now serving as the floor of our passage, my ice axe spinning chips into vertical space as our speed increases, then increases more, then becomes something more than speed as the cold, thin air slices through my mask and thermal garments and gloves and heated boots to freeze flesh and to tear at muscle. I feel the frozen skin of my cheeks stretching under my thermal mask as I grin idiotically, a rictal grimace of terror and the sheer joy of mindless speed, my arms and hands adjusting constantly, automatically, instantly to changes in the ice-axe tiller and the ice-hammer brake.

Suddenly A. Bettik swerves to the left, chips flying as he bites deep with the curved blades of both long and short axes—it makes no sense, such a move will send him—both of us!—bouncing off the inner wall, the vertical ice wall, and then screaming out into black air—but I trust him, making the decision in less than a second, and slam the blade of my large axe down, pounding hard with my ice hammer, feeling my heart in my throat as I skid sideways and threaten to slide right instead of left, on the verge of spinning and spiraling off the narrow ice ledge at 140 kilometers per hour—but I correct and stabilize and flash past a hole in the ice floor where we would have been sliding except for this wild detour, hurtling onto a broken-away ledge six or eight meters wide, a trapdoor to death—and then A. Bettik rackets down off the inner wall, catches his slide with a flash of ice-axe blades in the moonlight, and then continues hurtling down the Abruzzi Spur toward the final series of turns onto the Hua Shan ice slopes.