One glance was enough. The dawn was far enough advanced so that he could see both up and down the canon. It was patent that the girl had vanished during the darkness.
The whole affair was so utterly impossible, so unreal, so like an Arabian Nights adventure, that Ross was almost prone to believe that it had been merely a dream, a desert hallucination. Not until his eyes again sought the canon wall did he convince himself that he had not been laboring under some mental aberration.
There could be no denying his eyes, though. There were the four heavy chains fastened to the canon wall, and there were the four broken shackles, mute evidence that he had stumbled onto a situation as exotic as one of the desert’s own mirages.
No, there could be no question that the girl had actually existed. Nor could there be any question that she had disappeared. The only living thing in sight was Archibald, who stood with head bowed over the dead embers of last night’s fire in his usual state of ignoble dejection.
At first thought it seemed impossible that the girl could have left camp, unaided, and it seemed quite as certain that no one could have taken her away by force, without rousing Ross.
As he considered it, however, Ross realized that exhaustion would come quickly to one chained to the rock and exposed to the sun without food or water. Recuperation would probably come quite as quickly. The girl had had both water and nourishment the evening before, and it would have been quite possible for her to have gained sufficient strength to leave, had she so chosen. There seemed to be no other explanation.
“Well, Archibald,” said Ross, falling into his whimsical habit of addressing the burro, “when I started this trip I thought that you and Percy were the only asses in the party. Now I am convinced there are three of us. Here I have just been craving adventure for months. Yesterday I blundered right onto the craziest kind of a mystery, and then I go to sleep and let the whole thing get away from me! Fools can’t think, but I suppose they’ve got to eat,” he finished to himself.
He set about preparing his breakfast, meanwhile pondering the affair. The more he pondered the more mysterious it became.
Breakfast finished, he washed his dishes and then stepped over to gather up his bed-roll. Instantly he stopped short. There before him, scratched in the level sand of the canon floor, was a message: