Collection of three horror sequels to 'Psycho' (1960). In 'Psycho 2' (1983), Norman Bates (Anthony Perkins) has spent most of his adult life in a secure prison following the murders he committed over 20 years before. Judged sane by a psychiatric report, Norman is released and returns to his family home.

However, when he takes in a young female lodger, his old demons are in danger of resurfacing... In 'Psycho 3' (1986), a runaway nun seeks refuge at the Bates Motel where Norman is still in charge. Unfortunately for her, she has the same initials as Marion Crane, the woman he stabbed to death in 'Psycho' (1960), and she triggers some dangerous memories in him.

A fledgling love affair begins between the two but his demanding 'mother' is not happy with her son's choice of partner and is determined to exert her parental influence. Finally, in 'Psycho 4: The Beginning' (1990), Norman Bates is apparently completely reformed and happily married to a psychologist. However, his wife is pregnant and he fears that his unborn child will turn out like him, leading him to take drastic action.