In this period drama, Joan Fontaine stars as Ivy Lexton, a woman with an unusual hunger for men. Though she already has a husband, Jervis (Richard Ney), and is having an affair with Roger Gretorex (Patric Knowles), Ivy becomes obsessed with Miles Rushworth (Herbert Marshall), and is determined to have him. However, Miles has no interest in married women and rejects Ivy's advances. Angered, Ivy plans to get her revenge by poisoning Miles and pinning the blame on Roger. Cedric Hardwicke plays the inspector assigned to look into Miles' mysterious death.