This potentially brilliant and ingenious double identity thriller concerns about a Siamese twins(Margot Kidder, previous-Superman) are surgically separated by a doctor(William Finley, pre- Phantom of Opera). One sister is scarred physically and mentally when a murder occur in his apartment. The killing is witnessed by an investigative journalist(Jennifer Salt, post-Midnight cowboy). The intrepid reporter is helped by a private eye (Charles Durning,The fury) . And then things really get worse.

This scary triller is plenty of mystery, intrigue, and suspenseful. Adding special characteristics techniques as ominous camera movements and split screen. De Palma’s first homage to Hitchcock and the amusement turn out to be inquire what scenes taken from suspense Master. For that reason takes parts from ¨Vertigo, Psycho and Rear Window¨. All this said, the mechanics of suspense are worked quite well and may frighten the easily scared quite badly, but De Palma has made a habit of dwelling on their more sordid side-shoots. The film displays a great musical score by Bernard Hermmann, Hitchock’s favorite composer and imitating his former hits. Furthermore appropriate cinematography by cameraman Gregory Sandor. The picture is brilliantly directed by Brian De Palma. This one along with ¨Obsession,Dresssed to Kill, Blow out¨ are outwardly another ode to Hitchcock, but the Master might well shift uneasily in his grave at the long-drawn -out tension, the flash violent scenes and the shock effects with the accent on gas-provoking , but on most occasion without finesse.