Colwyn produced Penreath's match-box from his pocket and laid it on the table in front of him.
"Because of the knife and this match-box she thought you guilty."
"I! Why I never left my room after I went into it," exclaimed Penreath. "I left the match-box in the room where I had dined with Mr. Glenthorpe. When I awoke after falling asleep, and heard the noise in the room—just as you describe—I could not find my match-box when I wanted a match to light my candle, then I remembered that I had left it in the sitting-room on the mantelpiece. I happened to find a loose match in my vest pocket."
"Peggy came to see me at my hotel, after the trial, and told me all she knew," continued Colwyn. "It was well she did, for my second visit to the inn brought to light a number of facts which will enable me to establish your innocence."
"And what about the real murderer?" asked Penreath, in a hesitating voice, without looking at the detective.
"We will not go into that just now, unless you have anything to tell me that will throw further light on the events of the night." Colwyn shot a keen, questioning glance at the young man.
"I will answer any questions you wish to put to me. It is the least I can do after having made such a fool of myself. It was the shock of seeing Peggy in the room that robbed me of my judgment. I should have known her better, but you must remember that I had no idea she was in the house until I looked through the door in the wall which I had accidentally discovered, and saw her standing at the bedside, with the knife in her hand. I started to follow her home that day because I wished to know more about her. I lost my way in the mist. I met a man on the marshes who directed me to the village and the inn."
"When she heard your voice, and saw you going upstairs, she waited about in the hope of seeing you before she went to bed, as she wished to avoid meeting you in the presence of her father. When she saw Mr. Glenthorpe's door open she acted on a sudden impulse, and went in."
"I have been rightly punished for my stupidity and my folly," said Penreath. "I have wronged her beyond forgiveness."
"You really have not much to blame yourself for except your obstinate silence. That was really too quixotic, even if things had been as you imagined. No man is justified in sacrificing his life foolishly. And you had much to live for. You had your duty to do in life. Nobody knew that better than you—a soldier who had served his country gallantly and well. In fact, your silence has been to me one of the puzzles of this case, and even now it seems to me that you must have had a deeper motive than that of shielding the girl, because you could have asserted your innocence without implicating her."