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. Robert Ellery? He had left the house soon after ten, saying that he intended to walk back to his room at Chelsea. The inspector had not yet followed his trail; but he now made up his mind to do so, though he had not much faith in the result. Still, here was at least a loose end that needed tying. When he had made his list and tabulated his information, Inspector Blaikie did not feel that he had greatly advanced in his quest. Not one of the people on the list seemed in the least likely either to have committed the murders, or to have been even an accessory to them. He began to feel that he had not yet got at all on the track of the real criminal, or at least of the second one, if one of the two men had really killed the other. Was it some one quite outside the circle he had been studying, and, if so, how had that outsider got access to the house? He might have slipped in without being noticed, but it did not seem very likely, and it was far more difficult to see how he had slipped out. But, after all, George Brooklyn had got back somehow after 11.30, and, where he had come, so might another. Perhaps some one had slipped in and out by way of the theatre. So the inspector made up his mind to go over the whole scene again, and, above all, to find out more about the persons with whom he had to deal—their histories and still more their present ways of life: their loves and, above all, their animosities, if they had any. There, he felt, the clue to the mystery was most likely to be found. Accordingly, on the following morning—the second after the tragedy—Inspector Blaikie presented himself early at the office of Carter Woodman and sent up his card. Sir Vernon was still far too ill to be consulted, and the next thing seemed to be a visit to his lawyer, who, being both confidential adviser and a close relative, would be certain to know most of what there was to be known about the circumstances surrounding the dead men. Woodman had offered all possible assistance, and had himself suggested a call at his office.