On a September day in Manhattan in 1939, twenty-something Caroline Ferriday is consumed by her efforts to secure the perfect boutonniere for an important French diplomat and resisting the romantic advances of a married actor. Meanwhile across the Atlantic, Kasia Kuzmerick, a Polish Catholic teenager, is nervously anticipating the changes that are sure to come since Germany has declared war on Poland. As tensions rise abroad - and in her personal life - Caroline’s interest in aiding the war effort in France grows and she eventually learns about the dire situation at the Ravensbruck all-female concentration camp. At the same time, Kasia’s carefree youth is quickly slipping away, only to be replaced by a fervor for the Polish resistance movement. Through Ravensbruck - and the horrific atrocities taking place there told in part by an infamous German surgeon, Herta Oberheuser - the two women’s lives will converge in unprecedented ways and a novel of redemption and hope emerges that is breathtaking in scope and depth. From New York to Paris, and Furstenberg to Lublin, Martha Hall Kelly captures the powerful pull of human compassion, strong enough to stretch across continents and capable of triumphing over the grim evils of war. This is a striking story of an unsung heroine and her resolute will to right what is wrong.