“Because he knew something about Miss Ardfern, something that she did not wish should be known,” he said gently. “I am not suggesting it is anything discreditable to her,” he went on discreetly, detecting the cloud gathering on Tab’s face. “Some day she’ll tell us all about it I daresay. At present, it is unimportant.” He got up from his desk--they were talking in his office--and stretched himself. “This concludes the day’s entertainment, gentlemen,” he said, “and if you are dissatisfied, your money will be returned to you at the doors.” There were moments when Carver could be facetious. “No, I’m not going home. I have a couple of hours’ work here. I shan’t be disturbed. Happily the station telephone is out of order. A tree fell across a line somewhere between here and the exchange. Remember, Tab, only the briefest notes of Walters’ arrest. Nothing about the charge, not a single item of his statement, beyond the fact that he has made one.” Happily Jacques had gone home, or the news editor would have exploded at the meagre details with which Tab supplied his newspaper that night. He reached home at half-past eleven with a queer little ache at his heart. What was Ursula Ardfern’s secret? Why the mystery? Why must her mystery be interwoven with the greater and the more sordid mystery of the old man’s death? As he pushed open the door he saw a telegram in the box which was common to the whole of the flats, once the entrance door was closed. It was for him and he tore open the envelope and unfolded its flimsy contents. It was handed in at Naples and was from Rex. “Going on to Egypt. Quite recovered. Shall be back in a month.” He smiled to himself and hoped that “quite recovered” referred to his youthful infatuation as well as his disordered nerves. He paused outside the door of his flat to find his key and as he did so, he thought he heard a sound. It may have come from one of the flats above, but he did not give it any importance, and inserting the key, he caught a momentary flash of light through the transom of his sitting-room. It was as if at the second he had opened the door the lights in the sitting-room had been extinguished. It must have been an optical delusion, he thought, but the memory of the burglar came to him as he closed the door slowly behind him. For a second he hesitated, and then pushed open the closed door of the sitting-room. The first thing he noticed was that all the blinds were down, and he had left them up. He heard the sound of heavy breathing. “Who’s there?” he asked and then reached out his hand for the switch. Before his fingers could close upon the lever something struck him. He felt no pain, was conscious only of a terrific shock that brought him to his knees, incapable of thought or movement. Somebody pushed past him in the darkness. There was a slam of the flat door, a quick patter of feet on the stairs, and the street-door slammed.