Family Plot is a 1976 American dark comedy/thriller film that was the final film directed by Alfred Hitchcock. The film was based on Victor Canning's novel The Rainbird Pattern, which Ernest Lehman adapted for the screen. The film stars Karen Black, Bruce Dern, Barbara Harris and William Devane. The story involves two couples; one couple are amateur petty criminals, the other couple are smooth professionals. Their lives come into conflict because of a search for a missing heir. The film's title is a pun: "family plot" can refer to an area in a cemetery that has been bought by one family for the burial of its various relatives; in this case it also means a dramatic plot line involving various family members.