Director Brian De Palma made a name for himself with this twisty shocker starring a pre-SUPERMAN Margot Kidder as the mysterious Danielle. A French-Canadian model, Danielle may be covering up a murder to protect her recently separated homicidal Siamese twin--or maybe not. Plucky female reporter Grace Collier (Jennifer Salt) witnessed the killing from her apartment window but can't convince some clueless cops to investigate, so she hires a private detective (Charles Durning) to help her solve the case. Eventually she winds up at a mysterious sanitarium in the clutches of Danielle's creepy psychiatrist husband, Emil (William Finley), and begins to unravel the shocking truth.
- Golden Scroll, Best Horror Film (Nominee)
1975 Saturn Awards (United States)