Chaya Lindner is a teenager living in Nazi-occupied Poland. Simply being Jewish places her in danger of being killed or sent to the concentration camps. After her little sister is taken away, her younger brother disappears and her parents all but lose hope, but Chaya is determined to make a difference. Using forged papers and her fair features, Chaya becomes a courier and travels between the Jewish ghettos of Poland, smuggling food, papers, and even people.

Soon Chaya joins a resistance cell that runs raids on the Nazis’ supplies. But after a mission goes terribly wrong, Chaya’s network shatters. She is alone and unsure of where to go, until Esther, a member of her cell, finds her and delivers a message. That message chills Chaya to her core and sends her on a journey toward an even larger uprising in the works—in the heart of the Warsaw ghetto.