- Directors: Roman Polanski
- Writers: Roman Polanski, Gerard Brach, David Stone
- Genres: Thriller, Horror, Drama
- Actors: Catherine Deneuve, Ian Hendry, John Fraser
Carol (played by a 20-year-old Deneuve) is a young Belgian woman, who is both repelled and attracted by the idea of sex due to repressed memories. Timid and fragile, she lives in London with her sister Helen (Furneaux). When Helen leaves on a holiday to Italy with her married boyfriend (Hendry), Carol is left alone. Isolated at work too, she shuts herself up in their apartment, and becomes a slave of her own paranoid fears. As Carol becomes increasingly psychotic and unable to tell fantasy from reality, she begins to hallucinate. She violently kills a would-be suitor, Colin (Fraser), using a candlestick, and later the landlord (Patrick Wymark) who attempts to rape her. When her sister returns home, she finds Carol under her bed, catatonic, and only a shell of her former self.
At the end, Polanski shows a photograph of the young Carol, hinting at a childhood of sexual abuse, which would later resurface in Chinatown.