“No one could hear it. The kitchen stands right at the back of the house.”

“How did the burglar know no one would hear it? How dared he pull at a bell-rope in that reckless fashion?”

“Exactly, Mr. Holmes, exactly. You put the very question which I have asked myself again and again. There can be no doubt that this fellow must have known the house and its habits. He must have perfectly understood that the servants would all be in bed at that comparatively early hour, and that no one could possibly hear a bell ring in the kitchen. Therefore, he must have been in close league with one of the servants. Surely that is evident. But there are eight servants, and all of good character.”