The Mystery of Mr. X is a 1934 American Pre-Code crime film starring Robert Montgomery as a jewel thief who gets mixed up in a series of murders in 19th century London. It is based on the novel X v. Rex by Philip MacDonald (under the pen name Martin Porlock).Synopsis
London police constables are being killed by a man calling himself "Mr. X" (Leonard Mudie). By chance, one of the murders occurs around the same time and place as a diamond robbery, leading Police Commissioner Sir Herbert Frensham (Henry Stephenson) to suspect the same man is responsible for both, much to the annoyance of the thief, Nicholas "Nick" Revel (Robert Montgomery), and his confederates, taxi driver Joseph "Joe" Palmer (Forrester Harvey) and insurance clerk Hutchinson (Ivan F. Simpson).
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