Lilac Girls by Martha Hall Kelly (2016) Ballentine Books 

Three women go through WWII with different experiences from both side - two women are in Poland, one a doctor's sister who, along with her mother and sister, becomes a POW because her mother was a Jew, one a doctor who is drafted into service at Ravensbruk, the concentration camp for women, where her sense of right and wrong is shattered, making her a war criminal, and a woman in New York who has spent a decade helping French orphans.