Inquisitive journalist Grace Collier is horrified when she witnesses her neighbor, fashion model Danielle Breton, violently murder a man. Panicking, she calls the police. But when the detective arrives at the scene and finds nothing amiss, Grace is forced to take matters into her own hands. Her first move is to recruit private investigator Joseph Larch, who helps her to uncover a secret about Danielle's past that has them both seeing double.

Directed by: Brian De Palma
Written by: Brian De Palma & Louisa Rose
Release date: 1973-03-26
Runtime: 93 minutes
Critics score:
Tagline: They were joined at birth by the devil and the evil never left them!
Cast:
Margot Kidder Margot Kidder
Danielle Breton / Dominique Blanchion 
Jennifer Salt Jennifer Salt
Grace Collier 
Charles Durning Charles Durning
Joseph Larch 
William Finley William Finley
Emil Breton 
Lisle Wilson Lisle Wilson
Phillip Woode 
Barnard Hughes Barnard Hughes
Arthur McLennen 
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Also known as:
  • Hermanas diabólicas
  • Oi adelfes
  • Siamaies
  • To diplo prosopo mias gynaikas
  • Sestre
  • Siostry
  • Veitsi veressä
  • Sisters - Die Schwestern des Bösen
  • Irmãs
  • 悪魔のシスター
  • Blood Sisters