"I fail to recognize your right to cross-question me," replied the young man haughtily, "but I will answer your question. It was for the reason that you have supposed. I suspected his relations with my wife. There was his revolver to prove that he had been in her room. I do not know why Hazel Rath carried it away."

"Perhaps I could enlighten you on that point. As you knew so much, it is equally certain that you knew about your wife's missing necklace, though you did not tell me of that, either. But I will not go into that now—I wish to hurry on to my conclusion. I have at least done all that you asked me to do; I have proved Hazel Rath's innocence. But I have proved more than that. Captain Nepcote is also innocent."

"I should like to hear how you arrive at that conclusion." Phil strove to utter the words calmly, but his trembling lips revealed his inward agitation.

"His story, as told to me, fits in with facts of which he could have had no knowledge. He says he found the door of the left wing locked, and we know it was locked by Tufnell more than an hour before. He states that after the shot he hid in the woods in front of the house. It was there Tufnell thought he saw somebody hiding; it was there I found a scrap of khaki adhering to a bramble at the spot indicated by Nepcote as his hiding-place. Tufnell admits that he called out in alarm when his eye fell on the crouching figure. Nepcote says that he saw Tufnell, heard his cry, and plunged deeper into the bushes for safety. Tufnell returned along the carriage drive twenty minutes afterwards with Detective Caldew and Sergeant Lumbe. Nepcote heard the crunch of their feet on the gravel as they passed. His accuracy in these details which he could not possibly have known helped me to the conclusion that the whole of his story was true."

"He had plenty of time to commit the murder, nevertheless," said Phil.

"It is useless for you to try and cling to that theory—now."

There was something in the tone in which these words were uttered which caused the young man to look swiftly at the detective from beneath furrowed brows.

"You seem to have constituted yourself the champion of this scoundrel," he said, in a changed harsh voice.

Musard glanced from one to the other with troubled eyes. There was a growing hint of menace in their conversation which his mind, deeply agitated by the strange disclosures of the evening, could only fear without fathoming.

"I do not understand you," he said simply, addressing himself to Colwyn. "If this man Nepcote did not commit the murder, who did? Was it not he who was in the bedroom when Hazel Rath went there in the dark?"