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The Mystery of Mr. X (1934)

Passed | | Comedy, Crime, Mystery | 23 February 1934 (USA)
There have been a spate of London police murders, the victims always killed by a long knife (which the police know is a sword cane), the murders always taking place in a deserted but ... See full summary »


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(from the novel by), (screen play) | 2 more credits »


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Complete credited cast:
Inspector Connor
Sir Christopher Marche
Joseph Horatio Palmer
Ivan F. Simpson ...
Hutchinson (as Ivan Simpson)
Leonard Mudie ...
Mr. X
Judge Malpas
Charles Irwin ...


There have been a spate of London police murders, the victims always killed by a long knife (which the police know is a sword cane), the murders always taking place in a deserted but successively different part of town, and the police always being notified by the murderer that he will strike beforehand. By his signed notes, the murderer has dubbed himself as X. The police have their first real lead when the latest murder occurs outside the home where the Drayton Diamond was stolen on the same night. The diamond thief is Nick Revel, a suave, confident career thief, and his two accomplices, an insurance clerk named 'Hutch' Hutchinson, and a taxi driver named Joe Palmer. Nick, however, is not Mr. X, but he and his accomplices know they can't pawn the diamond or return the diamond for its insurance money now until Mr. X is caught. When a well known and respected man named Sir Christopher Marche is arrested for the murders on circumstantial evidence, Nick knows the police have the wrong ... Written by Huggo

Plot Summary | Add Synopsis


Passed | See all certifications »




Release Date:

23 February 1934 (USA)  »

Also Known As:

The Mystery of Mister X  »

Company Credits

Production Co:

Show detailed on  »

Technical Specs


Sound Mix:

(Western Electric Sound System)

Aspect Ratio:

1.37 : 1
See  »

Did You Know?


Preview audiences rejected the original ending, where "Nick" did not get "Jane". Retakes and additional scenes were ordered, but directed by Richard Boleslawski because director Edgar Selwyn was unavailable. See more »


Version of The Hour of 13 (1952) See more »

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User Reviews

"Tour de force" for Montgomery
20 February 2000 | by (West Virginia) – See all my reviews

This is Robert Montgomery's film all the way. This fine American Actor/Director is at his best and obviously has a lot of fun as he plays a second story man who just happens to steal a valuable diamond at the same time a policeman is murdered by a deranged killer. The killing takes place on the sidewalk just below where Montgomery has made his heist and, as the film unfolds, Scotland Yard comes to the erroneous conclusion that the theft and the murder have been committed by the same person. This leaves Montgomery in a precarious position and he realizes that to keep from being blamed for the murder he will have to bring the killer to justice by his own wiles. He is working on all of this while, at the same time, romancing the daughter of the head of Scotland Yard. There is plenty of good old fashioned suspense in this film to satisfy any mystery fan. There are also several light moments as we watch the romance between the jewel thief and the daughter of the Scotland Yard chief unfold. Lewis Stone, perhaps remembered best as Judge Hardy in that venerable series does a great job as another high Scotland Yard official who is suspicious of Montgomery from the start and plays a bit of a cat and mouse game with the thief. The ending is very satisfying as all matters are tied-up neatly. Enjoy...........

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