I had turned off the electric light, and it was quite dark.

I thought I heard a scream; but I can't be sure, for I felt thick-headed as a man does when he is called too soon after an extra long stretch of work.

Not that such was the case this time.
Anyhow my thoughts flew to the pistol.

I took it out, and ran on to the landing.

Then I heard a sort of scream, or rather a call for help, and ran into this room.