The Elusive Pimpernel (1950)
Foppish Sir Percy Blakeney, who secretly leads a double life as the daring rescuer of French aristocrats from the guillotine during the French Revolution, fights to save his brother-in-law while his wife is manipulated by the villainous Chauvelin into helping capture him, unaware of her husband's true identity.
Directed by: Emeric Pressburger, Michael Powell
Starring: David Niven, Margaret Leighton, Cyril Cusack, Jack Hawkins, Arlette Marchal, Gérard Néry
Links: IMDb, Movie posters, Movie stills