The Dark Mirror

A sister and her disturbed twin are implicated in a murder and a police detective must figure out which one's the killer.

• 
  Robert Siodmak

• 
  Olivia de Havilland
  Terry Collins / Ruth Collins
• 
  Lew Ayres
  Dr. Scott Elliott
• 
  Thomas Mitchell
  Lt. Stevenson
• 
  Richard Long
  Rusty
• 
  Charles Evans
  Dist. Atty. Girard
• 
  Garry Owen
  Franklin
• 
  Lela Bliss
  Mrs. Didriksen
• 
  Lester Allen
  George Benson
• 
  Bess Flowers
  Nightclub Patron (uncredited)
• 
  Ida Moore
  Mrs. O'Brien (uncredited)
• 
  Jean Andren
  Girard's Secretary (uncredited)
• 
  Marta Mitrovich
  Miss Beade (uncredited)
• 
  Jack Gargan
  Waiter (uncredited)
• 
  William Halligan
  Sergeant Temple (uncredited)
• 
  Charles McAvoy
  O'Brien (uncredited)
• 
  Jack Cheatham
  Policeman (uncredited)
• 
  Ralph Peters
  Dumb Cop (uncredited)
• 
  Ben Erway
  Police Lieutenant (uncredited)
• 
  Lane Chandler
  Intern (uncredited)