Cast of Family Plot

Barbara Harris plays Blanche Tyler, a psychic who becomes involved in a kidnapping scheme.

Bruce Dern portrays George Lumley, a private investigator hired to locate a missing person.

Karen Black appears as Fran, an accomplice in a fraudulent psychic operation.

William Devane is Arthur Adamson, a smooth-talking jewel thief posing as a philanthropist.

Ed Lauter plays Joseph Maloney, a criminal accomplice caught up in a series of deceptions.

Cathleen Nesbitt portrays Julia Rainbird, a wealthy woman seeking to reunite with her long-lost nephew.

Katherine Helmond is Mrs. Maloney, the wife of a criminal involved in a complex blackmail scheme.

Warren J. Kemmerling appears as Hank Granderson, a police detective investigating mysterious events.

Edith Atwater plays Mrs. Clay, a character intertwined in the web of deceit in the story.

William Prince is Bishop Wood, a religious figure caught up in the criminal activities of the protagonists.

Nicholas Colasanto portrays Victor Constantine, a shady character with ties to the criminal underworld.

Marge Redmond appears as Mrs. Vera Hannagan, a character entangled in the elaborate scam unfolding in the movie.