if I do deserve any praise in the matter, I think I deserve it for the way I pulled myself together in the face of the unexpected catastrophe of your arrival. Yes, I got a window open, Mr. Gillingham, under your very nose; the right window too, you were kind enough to say. And the keys—yes, that was clever of you, but I think I was cleverer. I deceived you over the keys, Mr. Gillingham, as I learnt when I took the liberty of listening to a conversation on the bowling-green between you and your friend Beverley. Where was I? Ah, you must have a look for that secret passage, Mr. Gillingham.
"But what am I saying? Did I deceive you at all? You have found out the secret—that Robert was Mark—and that is all that matters. How have you found out? I shall never know now. Where did I go wrong? Perhaps you have been deceiving me all the time. Perhaps you knew about the keys, about the window, even about the secret passage. You are a clever man, Mr. Gillingham.
"I had Mark's clothes on my hands. I might have left them in the passage, but the secret of the passage was now out. Miss Norris knew it. That was the weak point of my plan, perhaps, that Miss Norris had to know it. So I hid them in the pond, the Inspector having obligingly dragged it for me first. A couple of keys joined them, but I kept the revolver. Fortunate, wasn't it, Mr. Gillingham?
"I don't think that there is any more to tell you.
