It was a good plan. While he could keep his mind upon the game which had helped him to pass so many dull hours, he could think of nothing else, as it required close attention--and perhaps, as the day went on, his captors would begin to feel that it was not safe to run the risk of doing a thing as desperate as this would be. They might think better of it before they left the house at least. In any case, he had learned enough from Loristan to realize that only harm could come from letting one's mind run wild. "A mind is either an engine with broken and flying gear, or a giant power under control," was the thing they knew. He had walked in imagination through three of the cabinet rooms and was turning mentally into a fourth, when he found himself starting again quite violently. This time it was not at a touch but at a sound. Surely it was a sound. And it was in the cellar with him. But it was the tiniest possible noise, a ghost of a squeak and a suggestion of a movement. It came from the opposite side of the cellar, the side where the shelves were. He looked across in the darkness, and in the darkness saw a light which there could be no mistake about. It _was_ a light, two lights indeed, two round phosphorescent greenish balls. They were two eyes staring at him. And then he heard another sound. Not a squeak this time, but something so homely and comfortable that he actually burst out laughing. It was a cat purring, a nice warm cat! And she was curled up on one of the lower shelves purring to some new-born kittens. He knew there were kittens because it was plain now what the tiny squeak had been, and it was made plainer by the fact that he heard another much more distinct one and then another. They had all been asleep when he had come into the cellar. If the mother had been awake, she had probably been very much afraid. Afterward she had perhaps come down from her shelf to investigate, and had passed close to him. The feeling of relief which came upon him at this queer and simple discovery was wonderful. It was so natural and comfortable an every-day thing that it seemed to make spies and criminals unreal, and only natural things possible. With a mother cat purring away among her kittens, even a dark wine-cellar was not so black. He got up and kneeled by the shelf. The greenish eyes did not shine in an unfriendly way. He could feel that the owner of them was a nice big cat, and he counted four round little balls of kittens. It was a curious delight to stroke the soft fur and talk to the mother cat. She answered with purring, as if she liked the sense of friendly human nearness. Marco laughed to himself. "It's queer what a difference it makes!" he said. "It is almost like finding a window."