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The Dagger with Wings with the locked door; but it was really a very clever one. I myself walked past the hat-stand once without knowing it was anything but a hat-stand. I think that unconsciousness of mine will always give me a shiver.

"He might perhaps have left it at that; but I might have discovered the corpse at any minute; and, hung where it was, it was a corpse calling for what you might call an explanation. He adopted the bolder stroke of discovering it himself and explaining it himself.

"Then there dawned on this strange and frightfully fertile mind the conception of a story of substitution; the reversal of the parts. He had already assumed the part of Arnold Aylmer. Why should not his dead enemy assume the part of John Strake? There must have been something in that topsy turveydom to take the fancy of that darkly fanciful man. It was like some frightful fancy dress ball to which the two mortal enemies were to go dressed up as each other. Only, the fancy-dress ball was to be a dance of death: and one of the dancers would be dead. That is why I can imagine that man putting it in his own mind, and I can imagine him smiling."

Father Brown was gazing into vacancy with his large grey eyes, which, when not blurred by his trick of blinking, were the one notable thing in his face. He went on speaking simply and seriously.