In London, young diplomatic attaché Ronnie Adair, is playing bridge when he is called to a meeting with Professor Moriarty and blackmailed into transporting counterfeit money to Paris in his diplomatic pouch. Adair's concerned sister calls for the assistance of Sherlock Holmes and Dr. Watson to investigate the reasons for her brother's gambling excesses and depressed moods. After Adair dies from an apparent suicide, Holmes deduces Moriarty's involvement from a trail of clues.
In a contemporary review, The New York Times wrote: "There are secret doors leading into strange compartments and rooms, and there are scufflings and caterwaulings in dark corridors. All the characters express their contempt for one another by that sinister laugh—the 'ha, ha' which preceded the 'yeah' of modern gangdom. Detective Holmes barely escapes with his life, and the dear Dr. Watson is drawn away by innumerable red herrings."[3]
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