Jack Craigen, an engineer who has just finished a construction job in South Africa, returns to New York. There, at the home of his Uncle Cannell, he meets stage-struck society girl Helen Steele and her playwright fiancé Tracey. Scheming to win the lead in their new production, The Siren, Helen wagers Cannell and Tracey that she can vamp Jack--a notorious woman-hater--and have him propose to her in a week.