The Hour of 13 is a 1952 British historical mystery film directed by Harold French and starring Peter Lawford, Dawn Addams and Roland Culver.

The film's sets were designed by the German-born art director Alfred Junge.

The film is a remake of the 1934 thriller The Mystery of Mr. X, based on the novel X v. Rex by Philip MacDonald.

[2] Reminiscent of the Jack The Ripper school with a period setting in gaslit London, but this time the mysterious killer is The Terror who is murdering policemen.

Lawford plays the handsome gentleman thief Nicholas Revel who gets himself involved in the murders, and the theft of a valuable emerald.