London, 1942. Despite the raging war, spirited 18-year-old Nellie Morris lives a quiet life in the East End community of Bethnal Green. Her family and friends all tease that she will marry air raid warden Billy, the boy next door. The arrival of Ray, an American airman stationed nearby, causes Nellie to question everything she thought she knew about her future. Nellie’s new-found happiness is short-lived when an accident occurs during an air raid. Even the closest family can’t escape the devastation of war, and as the secrets and truth about that night become clear, they threaten to tear Nellie and those dearest to her apart.