The only son of wealthy widow Violet Venable dies while on vacation with his cousin Catherine. What the girl saw was so horrible that she went insane; now Mrs. Venable wants Catherine lobotomized to cover up the truth.

Elizabeth Tayloras Catherine Holly
Katharine Hepburnas Violet Venable
Montgomery Cliftas Dr. Cukrowicz
Albert Dekkeras Lawrence Hockstader
Mercedes McCambridgeas Grace Holly
Gary Raymondas George Holly
Mavis Villiersas Miss Foxhill
Patricia Marmontas Nurse Benson
Joan Youngas Sister Felicity
Jack Hildyard