Lady Loudwater had come through the library window at a quarter to twelve, and gone back through it at five minutes to twelve. Each of the last three had passed within fifteen feet of Lord Loudwater, dead or alive, both on entering and on coming out of the Castle. The mysterious woman had actually been in the smoking-room with him. If Lady Loudwater's statement that she heard her husband snoring at five minutes to twelve were to be accepted, neither Colonel Grey, Hutchings, nor the mysterious woman could have committed the murder--unless always one of them had returned later and committed it. That possibility must be borne in mind. But Mr. Flexen did not accept her statement. If he were to accept it, she herself at once became the most likely person to have committed the crime. It was always possible that she had. She certainly had the best reasons of any one, as far as he knew, for committing it. The evidence of Mr. Manley about the time at which he heard Lord Loudwater snore was of the first importance. But how to get it out of him? Mr. Flexen had a strong feeling that not only would Mr. Manley afford no help to bring the murderer of Lord Loudwater to justice, but, that owing to the vein of Quixotry in his nature, he was capable of helping the murderer to escape. That he could do. He had only to declare that he heard Lord Loudwater snore at twelve o'clock to break down the case against any one of the four persons between whom the crime obviously lay. Mr. Flexen had a shrewd suspicion that Mr. Manley would fail to remember at what time he had last heard Lord Loudwater's snores till the police had set about securing the conviction of one of the possible murderers. Then, when the case of the police against the murderer was revealed, he would come forward and break it down. He had decided that Mr. Manley was a sentimentalist, and he knew well the difficulty of dealing with sentimentalists. Moreover, Mr. Manley was animated by a grudge against the murdered man. Mr. Flexen could quite conceive that he might presently be regarding perjury as a duty; he had had experience of the queer way in which the mind of the sentimentalist works. It appeared to him that everything depended on his finding the mysterious woman.