1942, Warsaw. Young Zofia finds herself leading a double life when she is enlisted to help the fearless Irena Sendler save hundreds of Jewish children from the Warsaw Ghetto. Every night, Zofia risks her life to shepherd the children to safety. But when the worst happens, she is forced to make her riskiest journey yet to keep Irena's mission alive. Now, Seattle. After yet another miscarriage, heartbroken Lizzie returns to the comfort of her childhood home, where she stumbles upon a hidden photograph of her great-grandmother among a mysterious group of people. On a quest to discover more, Lizzie uncovers a buried past darker and more dangerous than she could ever have imagined...