Dementia 13 is a 1963 horror film directed by Francis Ford Coppola. The film follows a scheming woman who tries to manipulate her way into her wealthy husband's family fortune by faking her sister's death. However, her plan goes awry when a mysterious murderer begins targeting members of the family, leading to a series of gruesome deaths. The film is notable for its moody atmosphere, its eerie musical score, and its use of horror movie tropes such as creepy castles, secret passages, and shadowy figures. Although not initially successful, Dementia 13 has since become a cult classic and is seen as an early example of Coppola's talent as a filmmaker.