“Do you see any prospect of solving this mystery, Mr. Holmes?” she asked, with a touch of asperity in her voice.

“Oh, the mystery!” he answered, coming back with a start to the realities of life. “Well, it would be absurd to deny that the case is a very abstruse and complicated one, but I can promise you that I will look into the matter and let you know any points which may strike me.”

“Do you see any clue?”

“You have furnished me with seven, but, of course, I must test them before I can pronounce upon their value.”

“You suspect someone?”

“I suspect myself.”

“What!”

“Of coming to conclusions too rapidly.”