Midsummer madness strikes Julian Osborne when his wife Daisy goes to visit her sick father, leaving Julian behind to fall victim to the charms of his best friend Bob Meredith's neglected wife Margaret. One intoxicating night, after motoring to a mountain hunting lodge, Margaret is about to succumb to Julian's embraces when the sight of Bob and their daughter's portrait on the table brings her to her senses and she demands that Julian drive her home. When Daisy returns, her suspicions are aroused and she accuses Margaret of having an affair with her husband. Mary Miller, Margaret's daughter's nurse, attempts to shield her employer by accepting the guilt, but Margaret prevents her sacrifice by confessing everything, forcing Bob to realize how his neglect has injured his wife. The truth thus revealed, both couples repent and are reunited in friendship.