New York socialite Caroline Ferriday's world is forever changed when Hitler’s army invades Poland in September 1939 --- and then sets its sights on France. Kasia Kuzmerick, a Polish teenager, is drawn deeper into her role as courier for the underground resistance movement. For the ambitious young German doctor, Herta Oberheuser, an ad for a government medical position seems her ticket out of a desolate life. Once hired, though, she finds herself trapped in a male-dominated realm of Nazi secrets and power. The lives of these three women are set on a collision course when the unthinkable happens and Kasia is sent to Ravensbrück, the notorious Nazi concentration camp for women.

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