"This fact is highly significant, because the matches in Penreath's silver box are, as you see, blue-headed wax matches, whereas the matches struck in Mr. Glenthorpe's room on the night of the murder were of an entirely different description—wooden matches with pink heads, of British manufacture—so-called war matches, with cork pine sticks. The sticks of these matches break rather easily unless they are held near the head. Two broken fragments of this description of match, with unlighted heads, were found in Mr. Glenthorpe's room the morning after the murder. Superintendent Galloway picked up one by the foot of the bed, and I picked up the other under the broken gas-globe. The recovery of Penreath's match-box in the murdered man's room suggested several things. In the first place, if he had no other matches in his possession except those in his silver and enamel box, he was neither the murderer nor the second person who visited the room that night. But if my deduction about the matches was correct, how was it that his match-box was found in the murdered man's room? The inference is that Penreath left his match-box in the dining room after lighting his candle before going to bed, and the murderer found it and took it into Mr. Glenthorpe's bedroom to point suspicion towards Penreath.

"This fact opened up a new possibility about the crime—the possibility that Penreath was the victim of a conspiracy. When we were examining the footprints which led to the pit, the possibility of somebody else having worn Penreath's boots occurred to me, because I have seen that trick worked before, but the servant's story suggested that Penreath did not put his boots outside his door to be cleaned, but came to the door with them in his hand in the morning. But Penreath told me this morning that he put out his boots overnight to be cleaned, but had taken them back into his room before Ann brought up his tea. The murderer, therefore, had ample opportunity to use them for his purpose of carrying the body to the pit and to put them back afterwards outside Penreath's door.

"But Peggy's belated admissions did more than suggest that Penreath was the victim of a sinister plot—they narrowed down the range of persons by whom it could have been contrived. The plotter was not only an inmate of the inn, but somebody who had seen the match box and knew that it belonged to Penreath.

"I returned to Flegne to resume the investigations I had broken off nearly three weeks before, and from that point my discoveries were very rapid, all tending to throw suspicion on Benson. The first indication was the outcome of a remark of mine about his height, and the broken gas light in Mr. Glenthorpe's bedroom. It was purely a chance shot, but it threw him into a pitiable state of excitement. I let him think, however, that it was nothing more than a chance remark. That night I was put to sleep in Penreath's room, and there I made two discoveries. The first was the existence of a small door, behind the wardrobe, opening on a corresponding door on the other side, which in its turn opens into Mr. Glenthorpe's room. Thus it would be possible for a person in the room Penreath occupied, discovering these doors as I did, to see into the next bedroom—under certain conditions. My second discovery was the outcome of my first discovery—I picked up underneath the wardrobe a fragment of an appealing letter which Penreath had commenced to write to his fiancée, and had subsequently torn up. It was a long time before I grasped the full significance of these two discoveries. Why should a man, after writing a letter of appeal to his fiancée, decide not to send it and destroy it? The most probable reason was that something had happened to cause him to change his mind. What could have happened to change the conditions so quickly? The hidden doors in the wall, which looked into the next room, supplied an answer to the question. Penreath had looked through, and seen—what? My first thought was that he had seen the murder committed, but that theory did not account for the destruction of the letter, and his silence when arrested, unless, indeed, the girl had committed the murder. The girl—Peggy! It came to me like a flash, the solution of the strangest aspect of this puzzling case—the reason why Penreath maintained his dogged silence under an accusation of murder.

"It came to me, the clue for which I had been groping, with the recollection of a phrase in the girl's story to me—her second story—in which she not only told me of her efforts to shield Penreath, but revealed frankly to me her relations with Penreath, innocent enough, but commenced in chance fashion, and continued by clandestine meetings in lonely spots. I remembered when she told me about it all that I was impressed by Penreath's absolute straightforwardness in his dealings with this girl. He was open and sincere with her throughout, gave her his real name, and told her much about himself: his family, his prospects, and even his financial embarrassment. He went further than that: he told her that he was engaged to be married, and that if he could get free he would marry her. A young man who talks in this strain is very much in love. The artless story of Peggy revealed that Penreath was as much in love with the girl as she was with him. 'If he could get free!' That was the phrase that gave me the key to the mystery. He had set out to get free by writing to Miss Willoughby, breaking off his engagement. Later he had torn up the letter because through the door in the wall he had seen Peggy standing by the bedside of the murdered man, and had come to the conclusion that she had murdered him.

"If you think it a little strange that Penreath should have jumped to this conclusion about the woman he loved, you must remember the circumstances were unusual. Peggy had surrounded herself with mystery; she refused to tell her lover where she lived, she would not even tell him her name. When he looked into the room he did not even know she was in the house, because she had kept out of his way during the previous evening, waiting for an opportunity to see him alone. Consequently he experienced a great shock at the sight of her, and the mystery with which she had always veiled her identity and movements recurred to him with a terrible and sinister significance as he saw her again under such damning conditions, standing by the bedside of the dead man with a knife in her hand.

"Penreath's subsequent actions—his destruction of the letter he had written to Miss Willoughby, his hurried departure from the inn, and his silence in the face of accusation—are all explained by the fact that he saw the girl Peggy in the next room, and believed that she had committed this terrible crime.

"I now come to the clues which point directly to Benson's complicity in the murder. I have already told you of his alarm at my chance remark about his height and the smashed gas globe. You also know that he was in need of money. The next point is rather a curious one. When Benson was telling us his story the day after the murder I observed that he kept smoothing his long hair down on his forehead. There was something in the action that suggested more than a mannerism. The night after I discovered the door in the wall, I left it open in order to watch the next room. During the night Benson entered and searched the dead man's chamber. I do not know what he was looking for—he did not find it, whatever it was—but during the search he grew hot, and threw back his hair from his forehead, revealing a freshly healed scar on his temple. The reason he had worn his hair low was explained: he wanted to hide from us the fact that it was he who had smashed the gas-globe in Mr. Glenthorpe's room, and had cut his head by the accident.

"But his visit to the dead man's room revealed more than the scar on his forehead. How did Benson get into the room? The room had been kept locked since the murder. That night I had taken the key from a hook on the kitchen dresser in order to examine the room when the inmates of the place had retired. Benson, therefore, had let himself in with another key. This was our first knowledge of another key. Hitherto we had believed that the only key was the one found in the outside of the door the morning after the murder. The police theory is partly based on that supposition. Benson's possession of a second key, and his silence concerning it, point strongly to his complicity in the crime. He knew that Mr. Glenthorpe was accustomed to lock his door and carry the key about with him, so he obtained another key in order to have access to the room whenever he desired. There would have been nothing in this if he had told his household about it. A second key would have been useful to the servant when she wanted to arrange Mr. Glenthorpe's room. But Benson kept the existence of the second key a close secret. He said nothing about it when we questioned him concerning the key in the door. An innocent man would have immediately informed us that there was a second key to the room. Benson kept silence because he had something to hide.

"I now come to the events of the next morning. My investigation of the rise and the pit during the afternoon had led to a discovery which subsequently suggested to my mind that the missing money had been hidden in the pit. I determined to try and descend it. I arose before daybreak, as I did not wish any of the inmates of the inn to see me. Before going to the pit I got out of the window and into the window of the next room, as Penreath is supposed to have done. That experiment brought to light another small point in Penreath's favour. The drop from the first window is an awkward one—more than eight feet—and my heels made a deep indentation in the soft red clay underneath the window. If Penreath had dropped from the window, even in his stocking feet, the marks of his heels ought to have been visible. There was not enough rain after the murder was committed to obliterate them entirely. There were no such marks under his window when we examined the ground the morning after the murder.