It was possible that the first prints they had seen were those of one of their enemies, and that this man had carried the news of their coming to his companions. It would have been easy for the men of the camel feet--as Gray thought of them--to trail his party without being seen among the dunes. Or else, they might have been following Sir Lionel. Gray decided that this was what had happened. The men of the camel feet had been tracking the Englishman. This deduction led to another. The Hastings party had been attacked. Failing to turn them back, their assailants might have sent word of their approach to Sungan. "Let's see what I know," mused Gray methodically. "Camel feet armed with guns beaten off by Hastings' caravan--send news to Sungan. Ambuscade prepared at Sungan ruins for Sir Lionel. He walks into it. After attack by lepers, camel feet take up pursuit of him, tracking him back to well, where they engage us." Then the camel feet constituted a kind of outer guard of Sungan. They were poor fighters and seemed to have no heart for their work. The men who had wiped out the caravan were another kind. Sir Lionel had distinctly said they were not armed. They were lepers. There was then an outer and an inner guard of Sungan. The outer--composed of an indifferent soldiery--had been seen by the missionary Brent. The captive these guards had been pursuing had undoubtedly been a leper, escaped from the colony. Had Brent been done to death by the Chinese who knew what he had seen? If so, then Mary---- Gray groaned at the thought and the muscles of his jaw tightened. "I'm through the outer guards," he forced himself to reason. "But there's one thing that calls for an answer. Why do the Chinese force the lepers to drive off intruders? The poor devils are not good fighters. No better than the driven dogs Sir Lionel pictured them. They must have a hard master." It was possible, of course, that the Chinese priests who were masters of Sungan had forced the lepers to attack the caravan as a last resource, after Sir Lionel's men had driven off the outer guards. In China human life has a low value, and that of a leper is a small matter. Such a proceeding would be in keeping with the cruelty of the priests--who saw their own power and the prestige of ancient Buddha waning with the inroads of civilization. He was growing physically tired by now, to some extent. This growing weariness took toll of his thoughts, and brought the image of Mary before his memory. He pictured her as he had first seen her--a slender figure in the bright tent, mistress of well-trained servants. Gray had loved her from the first. It seemed to him it had been a long time. As nearly as he had ever worshiped anything, he worshiped the girl.