It's 1942 and Dorothy Taylor, now 18, dreams of distant lands far from the grey backstreets of Rotherhithe where she has spent all her life. As the war rages on, excitement comes in the form of the Americans posted in London. Although Dolly is engaged to Tony, a boy from her street who has been called up, she can't help but fall in love with Joe, a dashing American GI who eventually asks her to marry him. But America is not all she imagined it would be, and she's shocked by the cool welcome Joe's mother gives her. As she struggles to make friends and understand the man she's married, Dorothy begins to realise that she made a terrible mistake when she walked away from Tony, and wonders if he even remembers the innocent young girl who broke his heart. Only when she returns to Rotherhithe can she find out if there is still a chance of happiness for the two of them.