The pills

Sisters (released as Blood Sisters in the United Kingdom) is a 1972 American neo-noir psychological horror film directed by Brian De Palma and starring Margot Kidder, Jennifer Salt, Charles Durning, William Finley, and Lisle Wilson. It follows Dominique Blanchion, the separated conjoined twin of a French-Canadian model, Danielle Breton, who is suspected of having committed a brutal murder witnessed by Grace Collier, a newspaper reporter in Staten Island, New York City. Co-written by De Palma and Louisa Rose, the screenplay for the film was inspired by the Soviet conjoined twins Masha and Dasha Krivoshlyapova and features narrative and visual references to several films by Alfred Hitchcock. Filmed on location in Staten Island, the film prominently features split-screen compositions (also present in subsequent De Palma films such as Carrie), and was scored by frequent Hitchcock collaborator Bernard Herrmann. Released theatrically on April 18, 1973, Sisters was praised by critics, who noted its adept performances and use of homage. It was the first of a series of shocking thrillers for De Palma, and, in the years after its release, became a cult film.