“About nine in ten before dark,” he says. “Less if sunset catches us short of the slideway.”

“Let’s take the cables and slideway,” I say.

We wait in the short queue of market-goers leaving by cable, and then it is our turn to walk onto the step-off platform. The bamboo shelf is about twenty meters beneath the lowest marketplace scaffolding and it extends about five meters farther out over the abyss than does the rest of Phari.

Beneath us there is nothing but air for thousands of meters and at the bottom of that emptiness only the ubiquitous sea of clouds that rolls against the ridges of upthrust rock like a white tide spilling against stone pilings. More kilometers beneath those clouds, I know, are poisonous gases and the surging, acidic sea that covers all of this world except its mountains.

The cablemaster gestures us forward and A. Bettik and I step onto the jump platform together. From this nexus, a score or more of cables slant out and down across the abyss, creating a black spiderweb that disappears at the edge of vision. The nearest cable terminus is more than a kilometer and a half to the north—on a little rock fang that stands out against the white glory of Chomo Lori, “Queen of Snow”—but we are going east across the great gap between the ridges, our terminal point is more than twenty kilometers away, and the cable dropping away in that direction appears to end in midair as it blends into the evening glow of the distant rock wall. And our final destination is more than thirty-five klicks beyond that to the north and east. Walking, it would take us about six hours to make the long trip north along Phari Ridge and then east across the system of bridges and catwalks. Traveling by cable and slideway should take less than half that time, but it is late in the day and the slideway is especially dangerous. I glance at the low sun again and wonder again about the wisdom of this plan.

“Ready,” growls the cablemaster, a brown little man in a stained patchwork chuba. He is chewing besil root and turns to spit over the edge as we step up to the clip-on line.

“Ready,” A. Bettik and I say in unison.

“Keep ’ur distance,” growls the cablemaster and gestures for me to go first.

I shake my traveling risers loose from my full-body harness, slide my hands over the crowded gear sling that we call a rack, find the two-bearing pulley by feel, clip it on to the riser ring with a carabiner, run a Munter hitch into a second carabiner as a friction-brake backup to the pulley brake, find my best offset-D carabiner and use it to clip the pulley flanges together around the cable, and then run my safety line through the first two carabiners while tying a short prusik sling onto the rope, finally clipping that on to my chest harness below the risers. All of this takes less than a minute. I raise both hands, grab the D-ring controls to the pulley, and jump up and down, testing both the pulley connection and my clip-ons. Everything holds.

The cablemaster leans over to inspect the double-D-ring attachment and the pulley clamp with expert eyes. He runs the pulley up and back a meter, making sure that the near-frictionless bearings are sliding smoothly in their compact housing. Finally he puts all of his weight on my shoulders and harness, hanging on me like a second rucksack, and then releases me to make sure that the rings and brakelines hold.

I am sure that he cares nothing if I fall to my death, but if the pulley was to stick somewhere on the twenty klicks of braided monofilament cable running out there to invisibility, it will be this cablemaster who will have to clear the mess, hanging from his etriers or belay seat over kilometers of air while waiting commuters seethe. He seems satisfied with the equipment.

“Go,” he says and slaps me on the shoulder.

I jump into space, shifting my bulging rucksack high on my back as I do so. The harness webbing stretches, the cable sags, the pulley bearings hum ever so slightly, and I begin to slide faster as I release the brake with both thumbs on the D-ring controls. Within seconds I am hurtling down the cable. I lift my legs and sit back up into the harness seat in the way that has become second nature to me in the past three months. K’un Lun Ridge, our destination, glows brightly as sunset shadow begins to fill the abyss beneath me and evening shade moves down the wall of Phari Ridge behind me.

I feel a slight change in the cable tension and hear the cable humming as A. Bettik begins his descent behind me. Glancing back, I can see him leaving the jump-off platform, his legs straight ahead of him in the approved form, his body bobbing beneath the elastic risers. I can just make out the tether connecting the leather band on his left arm to the pulley brakeline. A. Bettik waves and I wave back, swiveling in my harness to pay attention to the cable screaming past me as I continue hurtling out over the gorge. Sometimes birds land on the cable to rest. Sometimes there is a sudden ice buildup or braid spurs. Very rarely there is a snagged pulley of someone who has met with an accident or cut away from their harness for reasons known only to themselves. Even more rarely, but enough to fix it in the mind, someone with a grudge or vague psychopathic tendencies will pause on the cable to loop a chock sling or spring-loaded cam around it, leaving a little surprise for the next person to come flying along the line. The penalty for that crime is death by flinging from the highest platform of Potala or Jo-kung, but this is of little solace to the person who first encounters the chock or cam. None of these eventualities materialize as I slide across the emptiness under the ultralight cable. The only sound is the slight hum from the pulley brake as I moderate my speed and the soft rush of air. We are still in sunlight and it is late spring on this world, but the air is always chilly above eight thousand meters. Breathing is no problem. Every day since I arrived on T’ien Shan, I thank the gods of planetary evolution that even with the slightly lighter gravity here—0.954 standard—the oxygen is richer at this altitude. Glancing down at the clouds some klicks below my boots, I think of the seething ocean in that blind pressure, stirred by winds of phosgene and thick CO. There is no real surface land on T’ien Shan, merely that thick soup of a planetary ocean and the countless sharp peaks and ridges rising thousands of meters to the O-layer and the bright, Hyperion-like sunlight. Memory nudges me. I think of another cloudscape world from a few months back. I think of my first day out in the ship, before reaching the translation point and while my fever and broken leg were healing, when I said idly to the ship, “I wonder how I got through the farcaster here. My last memory was of a giant…”

The ship had answered by running a holo taken from one of its buoy cameras as it sat at the bottom of the river where we had left it. It was a starlight-enhanced image—it was raining—and showed the green-glowing arch of the farcaster and tossing treetops. Suddenly a tentacle longer than the ship came through the farcaster opening, carrying what looked to be a toy kayak draped about with a mass of riddled parasail fabric. The tentacle made a single, graceful, slow-motion twist and parasail, kayak, and slumped figure in the cockpit glided—fluttered, actually—a hundred meters or so to disappear in the thrashing treetops.

“Why didn’t you come get me then?” I asked, not hiding the irritation in my voice. My leg still hurt. “Why wait all night while I hung there in the rain? I could have died.”

“I had no instructions to retrieve you upon your return,” said the arrogant, idiot-savant ship’s voice. “You might have been carrying out some important business that would brook no interruption. If I had not heard from you in several days, I would have sent a crawler drone into the jungle to inquire as to your well-being.”