As German bombs fall over London in 1940, working-class parents Millie and Reginald Thompson make an impossible choice: they decide to send their 11-year-old daughter, Beatrix, to America. Bea arrives in Boston to meet the Gregorys. Mr. and Mrs. G, and their sons William and Gerald, fold Bea seamlessly into their world. As Bea comes into herself and relaxes into her new life, the girl she had been begins to fade away…until she is called home to London when the war ends. Desperate as she is not to leave this life behind, Bea dutifully retraces her trip across the Atlantic back to her new, old world. As she returns to post-war London, the memory of her American family stays with her, always pulling on her heart as she tries to move on and pursue love and a life of her own.