"Word was sent to me from Wu Fang Chien—who had heard the news from a Chinese servant of the American Museum of Natural History—that an expedition was being fitted out to explore Central Mongolia. I was ordered to volunteer to accompany it."

"And you did your best to wreck the expedition," assented Gray.

"I liked you, Captain Gray. I tried to persuade you to turn back. At Liangchowfu it was too late. When you escaped from Wu Fang Chien there, he held me responsible for the failure. The priesthood never trusted me fully."

"In my religion," said Gray grimly, "there is a saying that a man can not serve two masters and save his own soul."

Delabar shivered.

"The priesthood," he muttered, "will not forgive failure. Wu Fang Chien is watching me. You can do nothing here. Go back, before we are seen together. Sungan is nothing but a leper colony. You were a fool to think otherwise."

"And the Wusun?"

"Lepers! They are the only ones here except the priests."

Gray's eyes hardened.

"A lie, Delabar. Why should Wu Fang Chien kill a dozen men to keep the English caravan and myself from Sungan?" He caught and held Delabar's startled gaze. "Where is Mary Hastings?"