"1942. Sadie Gault is eighteen and living with her parents amid the horrors of the Kraków Ghetto during World War II. When the Nazis liquidate the ghetto, Sadie and her pregnant mother are forced to seek refuge in the perilous sewers beneath the city. One day Sadie looks up through a grate and sees a girl about her own age buying flowers. Ella Stepanek is an affluent Polish girl living a life of relative ease with her stepmother, who has developed...