Tim Conway as Dr. Tart and
Don Knotts as Inspector Winship play two bumbling Scotland Yard investigators out to solve a double murder in this send-up of film noir and the mystery story. The intrepid Winship and his assistant Tart arrive at a Gothic mansion occupied by the grieving heiress Phyllis (Tricia Noble), whose parents have just been killed. Along with Phyllis are a crazed crew of employees ranging from the warrior cook to the well-endowed maid. The inept detecting duo stumble along from one prop to the next: paintings with moving eyes, a torture chamber, a monster, caped figures, and other oddities. ~ Eleanor Mannikka, All Movie Guide