He was a little, white-faced, clean-shaven, grizzly-haired fellow of fifty. He was still suffering from this sudden disturbance of the quiet routine of his life. His plump face was twitching with his nervousness, and his fingers could not keep still.

“We are investigating this unhappy business, Bannister,” said his master.

“Yes, sir.”

“I understand,” said Holmes, “that you left your key in the door?”

“Yes, sir.”

“Was it not very extraordinary that you should do this on the very day when there were these papers inside?”

“It was most unfortunate, sir. But I have occasionally done the same thing at other times.”

“When did you enter the room?”