Synopsis by Hal Erickson
Jane Mufin's stage play Love Flies in the Window was the basis for the RKO Radio assembly-line romance This Man is Mine. Happily married to dull but dependable Jim Dunlap (Ralph Bellamy), level-headed Toni Dunlap (Irene Dunne) suddenly finds herself forced to fight for her husband's affections. The cause of it all is Toni's old school chum, the recently divorced Fran Harper (Constance Cummings). Fran graciously makes no secret of her intention to steal Jim away. With equal graciousness, Toni beats her rival at her own game. In addition to the sterling contributions of its stars, This Man is Mine benefits from a well-honed supporting performance by Kay Johnson, who two years earlier had co-starred with Constance Cummings in Frank Capra's American Madness.
love, love-triangle, marriage, sister, man