On the outbreak of war, Belle Reilly's husband Jimmy enlists and heads for the deadly trenches of northern France. But Belle knows she cannot stand idly by when so many are sacrificing their lives.Volunteering to help battlefield wounded, Belle is posted to France as a Red Cross ambulance driver. There, a tragic accident brings her face to face with Etienne - a man from her past she's never quite forgotten. Torn between forbidden passion, loyalty and love, Belle is caught in an impossible situation. Will she succumb to the dark forces of this most brutal of wars? Or will fate intervene and finally lead her to lasting happiness?'The Promise' vividly describes life behind the front line and the tragic choices that war forces people to make.