While on a train, writer Richard Harland (Cornel Wilde) strikes up a connection with gorgeous young socialite Ellen Berent (Gene Tierney). Ellen quickly becomes enamoured with Richard, and abandons her fiancé, Russell Quinton (Vincent Price), to be with him.
The couple rushes into marriage, caught up in romance with Richard intrigued by Ellen's intensity. Only after settling into life together, however, does Richard realise Ellen is psychotically jealous – and her obsessive love for him threatens to be the undoing of them both.
