He could not sleep. Perched on an ancient leather stool upon the roof of the wireless building, he kept a nightly and a daily watch with his eyes fixed upon the drawbridge. A week went by. Food was carried up to him, and he scarcely touched it. The rims of his eyes became scarlet from sleeplessness, and he muttered constantly, like a man on the verge of insanity, as his eyes wandered back and forth over the red filth, from the shadowy bridge to the shining white of the palace.

Drearily, like souls lost and wandering in a half world, the prisoners of Len Yang trudged to the scarlet maws of the mine and were engulfed for long, pitiless hours, and were disgorged, staggering and blinking, in Tibet's angry evening sun.

The woeful sight would madden any man. And yet each day new souls were born to the grim red light of Len Yang's day, and clinging remorsefully to the hell which was their lot, other bleeding souls departed, and their shrunken bodies fed to the scarlet trough, where they were washed into oblivion in some sightless cavern below.

It was a bitterly cold night, with the wind blowing hard from the ice and snow on the Tibetan peaks, when Peter's long vigilance was rewarded. A booming at the gate, followed by querulous shouts, aroused him from his lethargy. He looked out over the crenelated wall, but the cold moonlight revealed a vacant street.

The booming and shouting persisted, and Peter was sure that Miss Vost had come, for in cities of China only an extraordinary event causes drawbridges to be lowered.

He slipped down the creaking ladder into the wireless-room. Harrison was in a torpor, muttering inanely and pleadingly as his long, white fingers opened and closed, perhaps upon imagined gold.

Peter opened the heavy brass door, and let himself into the deserted street. The jeweled sandals with which Chang had provided him sank deep into the red mire, and remained there.

He sped on, until he reached the black shadow of the great green wall. Suddenly the bridge gave way with many creakings and groanings and Peter saw the moonlight upon the silvery white road beyond.

A group of figures, mounted on mules, with many pack-mules in attendance, made a grotesque blot of shadow. Then a shrill scream.

Hoofs trampled hollowly upon the loose, rattling boards, and the cavalcade marched in.