Louis Trevelyan's refusal to believe in his wife Emily's fidelity destroys a perfect marriage and drives him literally insane. Suspicious beyond reason that she is having an affair with Colonel Osbourne a man of dubious reputation he forces his wife out of their house hires the seedy private detective Bozzle to spy on her and organises the kidnapping of their son with devastating consequences. Throughout Emily's protestation of her innocence and the couple's enduring love for each other despite their estrangement render the story moving and tragic.