In this noir drama, a successful fiction writer, Richard Harland (Cornel Wilde), meets a young beautiful socialite, Ellen Berent (Gene Tierney) on a train. After a short introduction, the pair falls in love. However, Ellen’s obsessive streak soon becomes evident when she unceremoniously ditches her politically successful fiancée Russell Quinton (Vincent Price) and makes a proposal of marriage to Richard. After their marriage, Ellen’s obsession with Richard mounts to the point where she becomes jealous of her pretty innocent sister Ruth (Jeanne Crain) and even of Richard’s disabled teen brother, Danny. Soon, Ellen finds herself capable of the most malicious and darkest deeds to re-gain the undivided attention of her beloved.