"The working class twin sister of a callous wealthy woman impulsively murders her out of revenge and assumes the identity of the dead woman. But impersonating her dead twin is more complicated and risky than she anticipated."
Bette Davis
as Margaret DeLorca / Edith Phillips
Karl Malden
as Sergeant Jim Hobbson
Peter Lawford
as Tony Collins
Philip Carey
as Sergeant Hoag
Jean Hagen
as Dede Marshall
George Macready
as Paul Harrison
Estelle Winwood
as Dona Anna
George Chandler
as George, Chauffeur
Mario Alcalde
as Garcia
Cyril Delevanti
as Henry, the Butler
Monika Henreid
as Janet
Bert Remsen
as Daniel 'Dan' Lister, Bartender
Charles Watts
as Apartment Manager
Ken Lynch
as Captain Johnson
Jon Lormer
as Alonzo (uncredited)
Perry Blackwell
as Organist at Edie's Bar (uncredited)
Charles Meredith
as Defense Attorney (uncredited)
Bryan O'Byrne
as Beemis (uncredited)
Leoda Richards
as Party Guest (uncredited)
Connie Cezon
as Margaret DeLorca (uncredited)
Charles Fredericks
as Tom Marshall (uncredited)
Herschel Graham
as Funeral Attendee (uncredited)
Paul Henreid
Director
Chuck Hansen
Assistant Director
Donfeld
Costume Design
Folmar Blangsted
Editor
William Stevens
Set Decoration
Jean Burt Reilly
Hair Supervisor
Albert Beich
Screenplay
Robert B. Lee
Sound
Florence Guernsey
Hairstylist
Rian James
Story
Ernest Haller
Director of Photography
Oscar Millard
André Previn
Music
Perry Ferguson
Art Direction
William H. Wright
Producer
Gordon Bau
Makeup Supervisor
Gene Hibbs
Makeup Artist
Bert Steinberger
Dialogue Coach
Sam Freed Jr.
Musician
Stand In