Presently Diego glanced at the loophole, and in an instant John whipped the tamale off the plate and thrust it under the cover of the cot. Then he went on calmly with his eating, and drank the usual amount of bad coffee. Diego, who had noticed nothing, took the empty tray and went out, carefully locking the heavy door behind him. Then John Bedford did something that showed his wonderful power of self-restraint. He did not rush to the bed, eager to read what the tamale might contain, but strolled to the loophole and looked out for at least a quarter of an hour. He did not wish any trick to be played upon him by a sudden return of Diego. Yet he was quivering in every nerve with impatience. When he felt that he was safe, he returned to the cot and took out the tamale. He carefully pulled it open, and in the middle he found the tough, fibrous substance that his teeth had met. He had half expected a paper of some kind, rolled closely together, that the writing might not perish, and what he really did find caused a disappointment so keen that he uttered a low cry of pain. He held it up in his hand. It was nothing more than a small package of thread, such as might have been put in a thimble. What could it mean? Of what possible use was a coil of fifty yards or so of thread that would not sustain the weight of half a pound? Was he to escape through the loophole on that as a rope? He looked at the loophole four inches broad, and then at the tiny thread, and it seemed to him such a pitiful joke that he sat down on the cot and laughed, not at the joke itself, but at any one who was foolish enough to perpetrate such a thing. He tested the thread. It was stronger than he had thought. Then he put it on his knee, took his head in his two hands, and sat staring at the thread for a long time, concentrating his thoughts and trying to evolve something from this riddle. It did mean something. No one would go to so much trouble to play a miserable joke on a helpless captive like himself. Catarina certainly would not do it, and she had given him the hint about the food, a hint that had come true. He kept his mind upon the one point so steadily and with so much force that his brain grew hot, and the wound, so nearly cured, began to ache again. Yet he kept at it, studying out every possible twist and turn of the riddle. At last he tested the thread again. It was undeniably strong, and then he looked at the loophole. Only one guess savored of possibility. He must hang the thread out of the loophole.