““There was no ground-floor — its ground-floor belonged to a house in the next court, and the front door opened direct upon a flight of stairs leading down to the cellar. Visitors on entering the house would suddenly shoot past the person who had answered the door to them and disappear down these stairs. Those of a nervous temperament used to imagine that it was a trap laid for them, and would shout murder as they lay on their backs at the bottom till somebody came and picked them up.””