It’s the second year of the Great War and eighteen-year-old Rosie Little is working at Charing Cross Station, helping the injured troops returning from the Front. The tired soldiers arriving on the platform adore Rosie’s kind, welcoming face as she serves them cups of tea, and they inevitably nickname her 'Rosie Lee'. 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 as man and wife. 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 their future together looks uncertain. 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.