Everything in Tibet starts with the wind. It is the wind that offers up prayer flags to the heavens, the wind that brings cold and warmth and life-giving water to the land, the wind that gives movement to the mountains themselves as it sends the clouds careening down the ranges. As he looked out from his high ledge, Shan Tao Yun remembered a lama once suggesting to him that the human soul first became aware of itself in Tibet because the wind never stops pushing against its inhabitants, and it is in pushing back against the world that a soul is defined. After nearly four years in Tibet, Shan believed it. It was as though here, the highest of all lands, was where the planet, gasping and groaning, began its rotation, here was where it learned to move, here was where it was the most difficult for people to hold on.

There was an exercise for enlightenment Shan had learned from the lamas that was called scouring the wind. Extend your awareness into the air and float with it, become mindful of the world it carries and absorb its lessons. He and his companions had hours before darkness fell, before it was safe to travel again, and he sat cross-legged on his high perch and tried it now. Drying heather, Shan sensed. A hawk soaring high over the valley. The sweet, acrid scent of junipers, tinged with the coolness of snow. The distant chatter of ground squirrels on the rock-strewn slopes. And suddenly, before a spreading plume of dust in the north, a single desperate rider.

As Shan shielded his eyes to study the intruding figure, a sharp syllable of warning cracked through the air. He turned to see Jowa, his Tibetan guide, pointing to an old man in a broad-brimmed brown hat walking toward the edge of the ledge, staring up the valley.

"Lokesh!" Shan shouted and leapt to grab his old friend, who seemed not to notice when Shan grasped his arm. He was blinking and shaking his head, staring at the figure approaching from the far end of the valley.

"Is it real?" Lokesh asked in a tentative tone, as if uncertain of his senses. The day before, he had seen a giant turtle on the top of a hill, a sign of good luck. He had insisted that they take it an offering and apologized because it had turned back into a rock by the time they had reached it.

"It is of this world," Shan confirmed as he squinted toward the horizon.

"He's frightened," Jowa said behind them. "He keeps looking back." Shan turned and saw that the wiry Tibetan had found their battered pair of binoculars and was studying the figure through the lenses. "That horse is dead if he keeps it up." The Tibetan looked back to his companions and shook his head. "Someone is chasing him," he said in a worried tone as he handed Shan the glasses.

Shan saw that the rider was clad in a dark chuba, the heavy sheepskin robe worn by the dropka, the nomads who roamed the vast plateau of northwestern Tibet. Behind the dropka's horse the dust was so thick that Shan could see no sign of a pursuer. He scanned the landscape. Snowcapped peaks edged the clear cobalt sky for miles in three directions, towering over the rugged grass-covered hills that lined the opposite side of the valley. Neither the long plain below them, brown with autumn-dried grass, nor the narrow dirt track from which they had retreated at dawn, gave any sign of life other than the solitary rider.

Shan could see the man's arms now, flailing his reins against the horse's neck. He looked down at their battered old Jiefang cargo truck, hidden behind a large outcropping a hundred feet from the road, then handed back the binoculars and stepped into the shadow of the overhanging rock where they had taken shelter after their night's ride.

Ten feet away, where the shadow was darkest, Shan dropped to his knees. By the ashes of the small fire where they had roasted barley flour for their only hot meal of the day, a solitary stick of incense had been thrust into a tiny cairn of stones. A blanket of yak felt had been folded and laid on the ground, and on the blanket, sitting silently in the cross-legged lotus fashion, was a man in a maroon robe. He had close-cropped graying hair, and his thin face would have been called old by many, but Shan never thought of Gendun as old, just as he never thought of mountains as old.

The lama's eyes were mostly closed, in what for him passed as sleep. Gendun refused to rest during the night, while they traveled in the old truck, and he did not lie down in the daylight rest shifts taken by his three companions but only drifted off like this, after Lokesh had made sure he had eaten.

"Rinpoche," Shan whispered, using the form of address for a revered teacher. "We may have to leave," he said. "There is trouble."

Gendun gave no sign of hearing him.

Shan looked toward Jowa, who was using the binoculars again to survey the landscape beyond the rider, then turned back to Gendun, noting for the first time that the lama had arranged his fingers in a mudra, one of the hand shapes used to focus meditation, a symbol of reverence to the Buddha. He studied the lama's fingers a moment. The wrists were crossed, the palms held outward, with the little fingers linked to form the shape of a chain. Shan paused and stared at the hands. It was an unusual mudra, one he had never seen Gendun make. The Spirit Subduer, it was called. It chilled Shan for a moment, then he sighed and rose with a slight bow of his head, stepping back to Jowa's side.

The young Tibetan was looking up the slope above them, as though searching for a way to climb over the mountain. They both knew that there was probably only one reason the rider was so scared. Shan looked once more at the truck. Their only hope was that it would not be seen. It would be a bad finish, to be stopped here, high on the remote plateau, short of their destination. Not simply because of the suffering they would face from the Public Security Bureau, but because they would have failed Gendun and the other lamas who had sent them.

Lokesh sighed. "I thought it would be longer," he said, and touched the beads that hung from his belt. "That woman," he said absently, "she still has to be settled in."

Settled in. The words brought back to Shan how different they all were, how differently they seemed to view the strange task that had been set for them. Gendun had been with the lamas who had summoned Shan from his meditation cell in their mountain hermitage, seated on cushions around an eight-foot mandala that had just been completed that afternoon. Four monks had worked for six months on the delicate wheel of life, composed of hundreds of intricate figures created of colored sands. Fragrant juniper had been burning in a brazier, and dozens of butter lamps lit the chamber. A low rumble like distant thunder rose from a chamber below them, the sound of a huge prayer wheel that required two strong monks to turn it. For a quarter hour they had gazed in silent reverence at the mandala, then Gendun, the senior lama and Shan's principal teacher, had spoken.

"You are needed in the north," he had announced to Shan. "A woman named Lau has been killed. A teacher. And a lama is missing." Nothing more. The lamas were shy of reality. They knew to be wary of facts. Gendun had told him the essential truth of the event; for the lamas everything else would be mere rumor. What they had meant was that this lama and the dead woman with a Chinese name were vital to them, and it was for Shan to discover the other truths surrounding the killing and translate them for the lamas' world.

He had not known how far they would travel, and when he had arrived as instructed at the hidden door that led to the outside world, he had assumed that it would be to the north end of the Lhadrung valley, to the settlement nearest the hermitage. Nor had he realized that Gendun was to accompany him. Even when Gendun appeared at the door, Shan had thought it was to bid him well or offer details of his destination. He had even assumed that the canvas bag of supplies the lama had brought was for Shan. But then he had seen Gendun's feet. The lama had removed the sandals he always wore under his robe and replaced them with heavy lace-up work boots.