A married man (Edmund O’Brien) leads a double life, keeping his second family secret. When his wife (Joan Fontaine) discovers his betrayal she must process the shock of this deception, while his mistress (Edith Head) faces her own frustrations and emotions. Directed by the pioneering Hollywood filmmaker and producer Ida Lupino, The Bigamist explores themes of loyalty, temptation, love and the idea of family, through the complex dynamic of a love triangle.