Holmes, putting his hand against the sloping wall. 'This is a trapdoor which leads out on to the roof. I can press it back, and here is the roof itself, sloping at a gentle angle. This, then, is the way by which Number One entered. Let us see if we can find some other traces of his individuality?'
He held down the lamp to the floor, and as he did so I saw for the second time that night a startled, surprised look come over his face. For myself, as I followed his gaze, my skin was cold under my clothes. The floor was covered thickly with the prints of a naked foot—clear, well-defined, perfectly formed, but scarce half the size of those of an ordinary man.'
'Holmes,' I said, in a whisper, 'a child has done this horrid thing.'
He had recovered his self-possession in an instant.
'I was staggered for the moment,' he said,
