Caroline Ferriday, a socialite in New York, has her hands full with her post at the French consulate, but on the eve of a fateful war, her world is changed forever when Hitler's army invades Poland in September, 1939; and then sets its sights on France. Kasia Kuzmerick, a Polish teenager, an ocean away from Caroline, senses her carefree youth disappearing as she is drawn deeper into her role as courier for the underground resistance movement. In a...