It's the second year of the Great War and Rosie Little is working at Charing Cross Station, helping the injured troops returning from the Front. Private Joe Upton is one such weary soldier and is instantly captivated by the lovely Rosie. The couple fall passionately in love and, although they are too young to get married, decide to live together, risking scandal and their parents' outrage. They find happiness in their new home: an abandoned railway carriage. But all too soon family conflicts drive a wedge between them, and at a time when no one seems able to escape the tragedy of war, Rosie and Joe are about to face their toughest test!