It's London, 1914. Belle Reilly finally has the life she's dreamed of thanks to a devoted husband in Jimmy. But as the storm clouds of WWI begin to gather, Belle's already turbulent life is to change in ways she never imagined possible. When Jimmy enlists in the army and leaves for the battlefields of Ypres, her world is shattered and she realizes she can no longer stand by and watch, she must volunteer to help the wounded. But her work as a Red Cross ambulance driver in France throws her into the path of Etienne, the enigmatic man who played a significant role in her childhood, and Belle finds herself torn agonizingly between forbidden passion and loyalty to a good man.