Has-been director Harry Dawes gets a new lease on his career when the independently wealthy tycoon Kirk Edwards hires him to write and direct a film. They go to Madrid to find Maria Vargas, a dancer who will star in the film.
Hans von Arnam travels to a Flemish village to study a strange carousel located in an old windmill that displays famous murderesses and other notorious women from history. Professor Gregorius Wahl, owner of the windmill, warns Hans to stay away from his mysterious daughter Elfi, in order to keep Hans from discovering the horrible secret shared by the Professor and Elfi's Doctor.
Two brothers part company only to be reunited when one is hired to stop a thief who turns out to be his sibling.
