The Bigamist (1953)

San Francisco businessman Harry Graham (Edmond O'Brien) and his wife and business partner, Eve (Joan Fontaine), are in the process of adopting a child. When private investigator Jordan (Edmund Gwenn) uncovers the fact that Graham has another wife, Phyllis (Ida Lupino), and a small child in Los Angeles, he confesses everything. In flashback, Graham tells of the strains in his marriage with Eve and how he found himself falling for the kind-hearted waitress Phyllis while on a business trip.