In Dario Argento’s directorial debut, Sam (Tony Musante), an American writer living in Rome, witnesses a vicious knife attack on a beautiful woman (Eva Renzi) inside an art gallery. After the police fail to make any progress in the case—and confiscate his passport, preventing him from leaving the country—Sam becomes obsessed with uncovering the black-leather-glove-wearing assailant’s true identity. His investigations only lead the murderer toward Sam and his girlfriend (Suzy Kendall). Featuring POV shots of the killer stalking the city at night, gory slow motion, and one of Ennio Morricone’s most distinctive scores, this giallo classic is not to be missed.