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Rh ; the body had only been found about twenty-six hours when I was examining the shoes; besides, why should any one wear them? The possibility of some one having borrowed Manderson's shoes and spoiled them for him while he was alive seemed about as negligible. With others to choose from he would not have worn these. Besides, the only men in the place were the butler and the two secretaries. But I do not say that I gave those possibilities even as much consideration as they deserved, for my thoughts were running away with me, and I have always found it good policy, in cases of this sort, to let them have their heads. Ever since I had got out of the train at Marlstone early that morning I had been steeped in details of the Manderson affair; the thing had not once been out of my head. Suddenly the moment had come when the dæmon wakes and begins to range.

Let me put it less fancifully. After all, it is a detail of psychology familiar enough to all whose business or inclination brings them in contact with difficult affairs of any kind. Swiftly and spontaneously, when chance or effort puts one in possession of the key-fact in any