A private investigator endures the rigors of an insane asylum in order to locate $1 million in stolen loot.

Stuart Whitmanas Dale Nelson / Arthur
Carol Lynleyas Cynthia Lee Albright
Roddy McDowallas Martin Ashley
Lauren Bacallas Dr. Edwina Beighley
Olive Deeringas Mrs. Mellon
Ossie Davisas Capshaw
Donald Bukaas Psychologist
Paulene Myersas Dr. Walden (as Pauline Myers)
Robert J. Wilkeas Technician Mike Newton (as Robert Wilke)