The touching story of what happens when you separate Siamese twins and one of ’em starts stabbing people in the face. This fun film marks the point that director Brian De Palma became arguably the Alfred Hitchcock of the 70s, a flashy craftsman of the sort of squirmy suspense that makes you want to yell at the screen (in a good way) and pleased as a peach in a pie with the perverse. Like Hitchcock’s Psycho, Sisters is about someone who’s more sick than you think they are. Like Psycho, this film’s pivotal moment is a sudden vicious murder scene. Like Psycho, it starts out centering on one particular character for about a half-hour only 
to eventually hand off the main part to a completely different character. And like Psycho, it’s hard to summarize without giving away the best surprises. The score by Bernard Herrmann further seals the deal.