Sandra Demarest (Barbara Stanwyck) has a secret that she can no longer keep. She goes to the Caldwell Estate and tells Mark Caldwell (Errol Flynn) that she secretly married his nephew James (Richard Basehart). The complication is that James recently died. Although Mark does not believe her story he allows her to stay at the estate while a search is conducted for the missing will that will help prove her story. James’ sister Julie (Geraldine Brooks) and Sandra become friends. Julie relates a story of hearing noises and terrible screams coming from the laboratory section of the estate. Sandra takes off on her own to investigate the noises now discovers what is really going on.