Winslow called Shan to a patch of moss below the shelf. It had been pressed down recently, by feet, and by reclining bodies.

"Two people," the American said as he squatted by the moss to study it. "Not last night, but recently." He turned and scanned the landscape urgently. Above Rapjung, in a small meadow less than five miles from where they now stood, they had seen two people who sought herbs, the ghost lama and his attendant. The American sprang up and began walking quickly, almost jogging, up the trail.

Twenty minutes later Winslow stopped and looked at a patch of snow high on the slope above them. "Why would Zhu hide?" he asked abruptly. "Why would he sneak around in the mountains without telling Jenkins?" He moved on, without waiting for a reply, walking rapidly until they reached the crest of the long ridge they climbed, where he flattened his map on a boulder. A high cliff jutted out to the west of them, forming a huge vertical wall that ran several hundred yards before cascading downward to the gorges below.

"We never asked where Zhu's team was," Shan said, "where they were when Zhu saw her body. We asked Jenkins about Larkin's team, but not about Zhu's." He studied the landscape. The cliff was the place Zhu had indicated on the map, the place where Larkin had fallen. Someone could have watched Larkin from the slope they had walked up, or from the flat ridge that ran parallel to the cliff, the one on which they stood. But not anyone on official venture business, for the ridge was outside the boundaries of the concession Jenkins had drawn on Winslow's map. Neither Larkin nor Zhu would have been inside their company's concession.

Half an hour later they were on top of the cliff, walking in grim silence, every few minutes pausing to gaze down into the shadows far below. Shan watched apprehensively as the American leaned out over the edge. In spots the footing was hard granite, but in many places debris of shattered rock and gravel lay underfoot. It would not be difficult for someone to slip and fall and certainly possible, even likely, for someone dizzy from altitude sickness to tumble into the shadows far below. Suddenly Winslow pressed his hand to his brow and Shan leapt forward.

"It's okay," Winslow said in a tight voice, pushing him away. "I took a pill."

"Did she have pills?" Shan asked.

"I don't know," the American replied, in a helpless tone. He stared down at a narrow ribbon of water that led away from the bottom of the cliff disappearing into the shadows of one of the gorges that twisted their way south.

Suddenly a patch of color caught Shan's eye; on a small ledge that jutted from the cliff face, a hundred feet away, twenty feet below the rim, a patch of light grey and blue in a pool of sunlight emerged from a tumble of boulders that filled a narrow fissure in the cliff face. He pointed, and Winslow darted away. By the time Shan reached him Winslow had already disappeared into the fissure that led to the ledge. "It's too dangerous," Shan called out. He saw now that the ledge had been formed when a slab of rock had cleaved away from the cliff and wedged itself in the fissure. It could be balanced there, for all he knew, ready to slide away under the pressure of a few more pounds of weight.

But Winslow was already on the ledge by the time Shan climbed into the fissure, and did not acknowledge Shan until he joined him on the tiny unprotected ledge. Shan shuddered as he saw how pale Winslow had become, and followed his gaze toward a body in the rocks. It was a dead bharal, one of the rare blue sheep that were nearing extinction. The animal had probably been dead a week, though it was hard to tell in the dry, cold air.

Winslow reached out to stroke the huge horns. "I thought…" the American began, then his voice drifted away. "I thought they never fell, a sheep like this, I thought their hooves gripped the rock."

Shan inched beside him and pointed to a patch of brown in the animal's neck, where the hair was matted together. "It didn't kill itself by falling," he said. "It was shot."

"Shoot it and leave it here? Who would…" Winslow's voice drifted again. After a long silence he stroked the horns again, then placed a tentative fingertip on the rich coat between the animal's ears. "I was sitting in the airport with a Tibetan bureaucrat, waiting while one of those bodies was loaded on a plane. He thought my job was very funny. He said the one thing Tibet is about, has always been about, is impermanence, and people should know that before coming." Winslow seemed to be trying to explain something to the sheep. "Afterwards I realized he thought it was amusing that people were surprised by impermanence." He began stroking the sheep between the ears, as if it needed comforting.

It felt as though they could not leave the dead animal, as though the beautiful sheep that had died alone, snatched unsuspecting from life in one cruel instant, deserved more. Shan considered the position of the body and the cliff above. The bharal had been on the top of the cliff, at the edge, surveying its domain, not knowing of the ways, until the last instant, when the ways of men had caught up with it.

"Larkin didn't do this," Winslow said, as if he knew the woman.

"No," Shan agreed. "Someone else was here."

The shot had been clean, probably with a high-powered rifle with a telescopic sight. It had not been made by a hunter, for the body could have been easily retrieved. It had been whimsy that had killed the beautiful creature, the act of one who killed because he could kill, a casual act by one who had snapped off a quick shot, laughed, and moved on.

They exchanged a grim glance and when Winslow rose it seemed he had a great weight on his back. He held onto the side of the fissure as though having trouble standing.

"We should do something," the American said, the helplessness back in his voice.

Shan did not reply, but began building a cairn on a flat rock above the sheep's head, exposed to the light and the wind. Working in silence, in ten minutes they had built a narrow two-foot cairn. Shan remembered the old khata, still in his pocket from where he had retrieved it above the oil camp, and anchored it under the top stone.

Winslow nodded solemnly and closed his eyes in what might have been a prayer, then climbed back up to the rim of the cliff. At the top he turned back toward the mixing ledge, apparently no longer interested in searching the cliff, and when they reached the main spine of the mountain he studied his map once more. "Yapchi," he said, "from here, if we could cross those two ridges-" He pointed to two long steep outriders to the north. "It's only four miles." He turned to Shan. "I want to know where Zhu's team is, where the other witnesses are."

An ache of foreboding coursed through Shan as the American spoke, for he knew Winslow was suggesting they try to traverse the treacherous terrain to reach the valley, which by now would be crowded with angry soldiers searching for Lin, but Shan knew the answers to their mysteries lay in the valley and the slopes above it. He offered a reluctant nod and gestured for him to lead the way. Ten minutes later Winslow stopped him with an upraised hand. Between them and the first of the ridges was a deep, impassable gorge not marked on the map. They would not reach Yapchi that day. The American began to turn back, then paused and pointed with a grin. On the crest of the ridge beyond, far beyond earshot, walked a monk and a yak, with the yak in front, as though leading the monk somewhere. Gyalo and Jampa had disappeared, Lepka had explained, after leaving him on the narrow trail that descended to the mixing ledge.