Twins Edith and Margaret (Bette Davis in a dual role) both desire a wealthy Spaniard, but Margaret marries him under false pretense in this dark tale from director Paul Henreid about a vengeful sister who assumes her twin's identity. Years later, widowed Margaret lives the high life, while Edith can't afford lunch. Edith kills Margaret and takes her place, but arouses the suspicion of a detective (Karl Malden) and Margaret's lover (Peter Lawford).