Based on a true story. New York socialite Caroline Ferriday works at the French consulate at the beginning of World War II and becomes involved in the efforts to help people caught in the war overseas, and with a married French actor. In Germany, Herta Oberhauser is a trained doctor who longs for more challenging work, and finds herself at Ravensbruck, the Nazi concentration camp for women, performing barbaric surgical experiments. And in Poland, teenager Kasia Kuzmerick becomes a courier for the resistance and finds herself imprisoned with her mother and sister at Ravensbruck. The novel uses all three points of view. The women’s lives converge after the war in unexpected ways. Excellent book for book club discussion.