Marco turned and stood with his back against the door. The cat had awakened and she was gazing at him with her green eyes. She began to purr encouragingly. She really helped Marco to think. He was thinking with all his might and trying to remember. "What did she come for? She came for something," he said to himself. "What did she say? I only heard part of it, because I was asleep. The voice in the dream was part of it. The part I heard was, 'You will have to search for it. I have not a moment.' And as she ran down the passage, she called back, 'You are too good for the cellar. I like you.'" He said the words over and over again and tried to recall exactly how they had sounded, and also to recall the voice which had seemed to be part of a dream but had been a real thing. Then he began to try his favorite experiment. As he often tried the experiment of commanding his mind to go to sleep, so he frequently experimented on commanding it to work for him--to help him to remember, to understand, and to argue about things clearly. "Reason this out for me," he said to it now, quite naturally and calmly. "Show me what it means." What did she come for? It was certain that she was in too great a hurry to be able, without a reason, to spare the time to come. What was the reason? She had said she liked him. Then she came because she liked him. If she liked him, she came to do something which was not unfriendly. The only good thing she could do for him was something which would help him to get out of the cellar. She had said twice that he was too good for the cellar. If he had been awake, he would have heard all she said and have understood what she wanted him to do or meant to do for him. He must not stop even to think of that. The first words he had heard--what had they been? They had been less clear to him than her last because he had heard them only as he was awakening. But he thought he was sure that they had been, "You will have to search for it." Search for it. For what? He thought and thought. What must he search for? He sat down on the floor of the cellar and held his head in his hands, pressing his eyes so hard that curious lights floated before them. "Tell me! Tell me!" he said to that part of his being which the Buddhist anchorite had said held all knowledge and could tell a man everything if he called upon it in the right spirit. And in a few minutes, he recalled something which seemed so much a part of his sleep that he had not been sure that he had not dreamed it. The ringing sound! He sprang up on his feet with a little gasping shout. The ringing sound! It had been the ring of metal, striking as it fell. Anything made of metal might have sounded like that. She had thrown something made of metal into the cellar. She had thrown it through the slit in the bricks near the door. She liked him, and said he was too good for his prison. She had thrown to him the only thing which could set him free. She had thrown him the _key_ of the cellar!