Family Plot

Family Plot is a 1976 American black comedy thriller film directed by Alfred Hitchcock in his final directorial feature, and starring Karen Black, Bruce Dern, Barbara Harris, and William Devane. It was based on Victor Canning's 1972 novel The Rainbird Pattern, which Ernest Lehman adapted for the screen. The film was screened at the 1976 Cannes Film Festival but was not entered into the main competition.

Synopsis: Wikipedia, CC BY-SA 4.0