Fake medium Madam Blanche (Barbara Harris) and her taxi driver boyfriend George (Bruce Dern) make a living by scaming people with her phoney powers. They are hired by an aging widow, Julia Rainbird, to find her nephew who was given away for adoption many years earlier following a family scandal. Meanwhile, an extremely clever couple, diamond merchant Arthur Adamson (William Devine) and his attractive girlfriend Fran (Karen Black), are behind a series of kidnappings of various VIPs in the San Francisco area. The two couples paths soon cross and chaos results in Hitchcock's last film.