When Inspector Blaikie got to his own room, he sat down with a sheet of paper in front of him, and on it made out, from his notes, a list of all the persons whom he knew to have been in the house the previous night. It was a long list, and he made it out more to set his subconscious mind free to work than with any idea that it would throw a direct light on the problem. Having made his list, he began to write down, after each name, exactly what was known about its owner’s doings and movements on the night before. He left out nothing, however unimportant it might seem; for he had fully mastered the first principle of scientific detection—that detail generally gives the clue to a crime, and that therefore every detail matters.

He began with those who seemed least likely to have had any hand in the business. First there were the four maid-servants. They had gone to bed before eleven. They slept two in a room, and there seemed no reason to doubt that, as they said, they had all slept soundly. He did not dismiss them from his mind, but he had nothing against them so far.

Then there was the lady’s maid, Agnes Dutch. She had slept alone on the first floor, in a little room next to that of Joan Cowper. She had felt tired, she said, and had gone to bed at 10.30, after making sure that Miss Joan would not want her again. She seemed a nice, quiet girl, and, although she seemed very upset in the morning when the inspector saw her, that was no more than was to be expected. There was nothing against her either. Besides, Mary Woodman had not gone to bed until after twelve, and she said that she was certain the girl was in her room until then. She had been sitting in the big landing-lounge reading, and both Joan’s and the maid’s doors opened on to the lounge.

What of Mary Woodman herself? She had been with Joan until about eleven, and had then sat for an hour reading. No one had seen her during that hour, or heard her go to bed afterwards. But Mary notoriously got on with everybody and had not an enemy in the world. Every one had told the inspector, without need of his asking the question, that she was the very last person to have anything to do with a murder. Besides, the whole thing was clearly a man’s job. The inspector filed Mary Woodman in his mind for future reference; but he felt quite sure that she knew nothing about the crimes.

Then, to finish the women, there was Joan Cowper. She had discovered George Brooklyn’s body in the garden, and her manner after the discovery seemed to be sign enough that it had come to her as a horrifying surprise. Certainly, she had known nothing about George Brooklyn’s death; but she might, for all that, be in a position to throw some further light upon the crimes. He had asked her in the garden how she had spent the previous evening; and she had answered without hesitation. After seeing Sir Vernon to his room shortly after ten, she had sat with Mary Woodman in the lounge until eleven o’clock, and had then gone to bed. Her maid had come to her rather before half-past ten and she had told her she would be needed no more that night. Mary Woodman, who had sat on in the lounge, confirmed this, and stated that Joan had not left her room before midnight. Certainly there seemed to be nothing to connect Joan with the crimes. She was a fine young lady, the inspector reflected. She had borne up wonderfully.

Next there were the men, and it was among them that the criminal, if, as Blaikie suspected, he was one of the intimate circle of Liskeard House, would probably be found. Sir Vernon Brooklyn was clearly out of it. He was a feeble old man whose hand could not possibly have struck those savage blows. He was reported to be very fond of both his nephews; and he had undoubtedly gone to bed at a quarter past ten. So much for him. He might know things or suspect, but he could have had no hand in the murders. At present, the inspector had been told, he was prostrated by the news of Prinsep’s death, and his doctor had forbidden any mention of the matter in his presence. He did not even know yet that George Brooklyn was dead.

The only other men who had slept in the house were the two servants—Winter and Morgan. Morgan seemed to be cleared of suspicion, at least if Winter had told the truth. But might not Winter himself have had a hand in the affair? The superintendent had dropped a plausible hint, and there might be something in it. Inspector Blaikie wrote it down as possible, but unlikely. Two other menservants, who had waited at dinner, did not sleep in the house, and had left soon after half-past eleven. They had been busy clearing up until the very moment of their departure, and it seemed plain that they had enjoyed neither time nor opportunity for any criminal proceeding. Besides, they were strangers, imported for the evening from the restaurant attached to the theatre. As robbery had evidently not been a motive in either murder, there was the less reason to think seriously about them. They could have had no motive.

Next, the inspector turned to a consideration of the guests who had been at the dinner. These were, first, George Brooklyn and his wife. About George he had already noted down all that he knew. What of Mrs. George? Inquiries which the sergeant had made established that she had gone straight back to her hotel—the Cunningham—soon after ten o’clock. George had left her in the care of the Woodmans, parting from them at the door of the theatre on plea of an appointment. Mrs. George—or, as she was better known both to the inspector and to all London, Isabelle Raven, the great tragedy actress—had then sat talking with Mrs. Woodman in the sitting-room which they shared at the hotel until “after eleven,” when she had gone to bed, expecting that her husband might come in at any moment. She had gone to sleep and had only discovered his absence when she woke in the morning. She had been worried, and after a hasty breakfast she had hurried across to Liskeard House with Helen Woodman to make inquiries. There she had been met with the fatal news. She was now lying ill in her room at the Cunningham Hotel, with Mrs. Woodman in faithful attendance upon her.

This recital clearly brought up the question of the Woodmans, man and wife. When they returned to the hotel with Mrs. George, Carter Woodman had gone to one of the hotel waiting-rooms to write letters, leaving the two women together. He said that he had remained at work till 11.45 or so, when he had gone down to the hall and asked the night porter to see some important letters off by the first post in the morning. This was corroborated by the night porter, who had so informed the sergeant. Carter Woodman had then gone straight to bed—a statement fully confirmed by his wife. This seemed fairly well to dispose of any connection of either the Woodmans or Mrs. George with the tragedy.

Harry Lucas? Sir Vernon’s old friend had left in his car for Hampstead at ten minutes past ten after a few farewell words with Sir Vernon. He had reached home soon after 10.30, and had gone straight to bed. This had been already confirmed by police inquiries at Hampstead during the morning.