“ ‘I have said that the house is a rambling one. One day last week—on Thursday night, to be more exact—I found that I could not sleep, having foolishly taken a cup of strong café noir after my dinner. After struggling against it until two in the morning, I felt that it was quite hopeless, so I rose and lit the candle with the intention of continuing a novel which I was reading. The book, however, had been left in the billiard-room, so I pulled on my dressing-gown and started off to get it.
“ ‘In order to reach the billiard-room I had to descend a flight of stairs and then to cross the head of a passage which led to the library and the gun-room. You can imagine my surprise when, as I looked down this corridor. I saw a glimmer of light coming from the open door of the library. I had myself
