A convict (Emrys Jones) discovers a double and assumes his identity, not knowing what he's in for. Ann: Zena Marshall. Clements: John Horsley. Canning: Hector Ross. Mrs. Fenton: Joan Hickson.
Jones, escaped from prison, finds the dead body of a man who looks just like him. He switches identities with the corpse, then discovers that the man was a spy. An idea done much better in Antonioni's THE PASSENGER (1975), but still occasionally entertaining.