Dario Argento's masterpiece of horror, with its assault of garish colors, booming soundtrack and horrifically dreamlike set pieces, is the cinematic equivalent of an exceptionally scary fun house. It tells the story of Susan (Harper) a young, impressionable American who travels abroad in order to study at a prestigious European ballet academy. From the first day, however, she begins to realize that frightening things are afoot at the hallowed institution. Enduring a rain of maggots, poisoned food and other unpleasant occurrences, she discovers that the school is a secret convening place for an ages-old witches' coven. Cut to various lengths due to violent content, the film's original full running time is 100 minutes.