“Oh!” exclaimed the servant. “I heard you. I wondered who was coming in.”

“I just went downstairs with our visitor. Did he tell you his name, Oscar?”

“Who?”

“The man who was here. The man in the black cloak.”

“I saw no man, sir.”

“What! Didn’t you let him in a half hour ago?”

“No, sir. I have been asleep since ten o’clock.”

Doctor Lukens gasped.

“Was the front door locked?” he questioned.

“Certainly, doctor,” replied Oscar. “I always lock it — and bolt it, sir.”