“When I entered the yard I thought I saw a man going along on the far side of it; but it was so dark I could not make out his figure.

“I crossed to that corner and found a dirty dark staircase. I heard a man mounting up above me, some way higher than I was, and thinking I should catch him before his door would be opened to him, I rushed after him. I heard a door open and shut on the fifth storey, as I panted along; the stairs were narrow, and the steps innumerable, but at last I reached the door I thought the right one. Some moments passed before I found the bell and got it to ring.