 Bruce and Marie Chapman have marital trouble because of her compulsive gambling. After Bruce cuts off her funds and leaves town, Marie blackmails her former husband and his wife, Walter and Helen Sprague. She flies to Las Vegas to contact her former partner is a "sister" act, Virginia Hobart. When Bruce returns, he receives divorce papers from Marie, and consults Perry Mason. Bruce finds Marie s car at the bottom of a canyon near their home and identifies her body for Lt. Tragg, who arrests Bruce for murder. Perry wades through a succession of look-alike women and red herrings in solving the case.