"Once I was outside the house and could see the friendly stars all my fears vanished. I know the marshes so well that I can find my way across them at any time. And in my heart I had the feeling that I had been brave and helped him. When I had thrown the knife into the sea from the breakwater I felt almost lighthearted, and when I reached my room again I fell asleep as soon as I got into bed.
"Until you spoke to me the next day I had no idea that you had seen and followed me. But I knew it the moment you stopped me and said you wanted to speak to me. Then I realised you had watched me, and the story I told you to account for my visit to the room came into my head. I did not know whether you believed me or not, but I did not care much, because I knew you could not have seen what I threw into the sea. That secret was safe as long as I kept silence; and you couldn't make me speak against my will."
Peggy, as she concluded, glanced up wistfully to see how her companion received her story, but she could learn nothing from the detective's inscrutable face. Colwyn, on his part, was thinking rapidly. He believed that the innkeeper's daughter, yielding to the strain of a secret too heavy to be borne alone, had this time told him the truth, but, as he ran over the main points of her narrative in his mind, he could not see that it shed any additional light on the murder. The only new fact that she had revealed was that she and Penreath had been acquainted before. She had also, perhaps unconsciously, given away the fact that she and Penreath were in love with each other; at all events, her story proved that she was so deeply in love with Penreath that she had displayed unusual force of character in her efforts to shield him. But that knowledge did not carry them any further towards a solution of the mystery. It was with but a faint hope of eliciting anything of real value that he turned to her and said:
"There is one point of your story on which I am not quite clear. You said that in the morning, when you heard of the recovery of Mr. Glenthorpe's body from the pit, you knew that Mr. Penreath was the murderer. Why were you so sure of that? Was is because you picked up the knife with which the murder was committed? The knife was a clue—the police theory of course is that Penreath secreted the knife at the dinner table for the purpose of committing the murder—but, by itself, it was hardly a convincing clue. Was there something else that made you feel sure he was guilty of this crime?"
"Yes, there was something else," she repeated slowly.
"I thought as much. And that something else was the match-box—is that not so?"
"Yes, it was the match-box," she repeated again, this time almost in a whisper.
"What was there about the match-box that made you feel so certain?"
"Must I tell you that?" she said, looking at him helplessly.
"Of course you must tell me." Colwyn's face was stern. "As I told you before, nothing you can do or say can hurt him now, and the only hope of helping him is by telling the whole truth."