Dr. John Watson treats a patient who has lost a thumb. The patient says that the loss of his thumb was not an accident but the result of an attack. However, he fears that the story behind the loss of his digit is so strange that the police will not believe it.
A society cracksman is caught when his dying victim pulls out his glass eye. There's a hint of Holmes' nemesis Professor Moriarty to the criminal mastermind of this WWI crime entertainment.
