“I have had several opponents to whom that flattering term has been applied,” said Holmes with a smile. “Don’t you smoke? Then you will excuse me if I light my pipe. If your man is more dangerous than the late Professor Moriarty, or than the living Colonel Sebastian Moran, then he is indeed worth meeting. May I ask his name?”

“Have you ever heard of Baron Gruner?”

“You mean the Austrian murderer?”

Colonel Damery threw up his kid-gloved hands with a laugh. “There is no getting past you, Mr. Holmes! Wonderful! So you have already sized him up as a murderer?”