The night that Rachel and Toby's parents are taken away by the Nazis, they give their young daughters three gold coins with the instructions to "use these wisely to help save your lives." They also ask the girls to promise that they will always stay together. This compelling true story follows the sisters as they confront the daily horrors of Auschwitz, protecting one another, sharing memories, fears, and even laughter—always together. But when Rachel becomes ill and is taken away by Nazi guards, likely forever, Toby risks her own life and uses the well-hidden gold coins to rescue her little sister.