In 1944, twin sisters Pearl and Stasha Zagorski arrive in Auschwitz and become part of the experimental population of twins known as Mengele's Zoo. That winter, at a concert orchestrated by Mengele, Pearl disappears and Stasha is left in the Zoo alone, clinging to hope that her twin remains alive. After the Red Army liberates the camp, Stasha and her companion, Feliks --- who has also lost his twin to Mengele's Zoo --- travel through a devastated Poland, undeterred by injury, starvation or the chaos around them. As the young survivors discover what has become of the world, they must try to imagine a future within it.