Fourteen-year-old Alexander Altmann doesn't need to look at the number tattooed on his arm. A10567: he knows it by heart. He also knows that to survive Auschwitz, he has to toughen up. When he is given the job of breaking in the commander's new horse, their survival becomes intertwined. Alexander knows that the animal is scared and damaged, but he must win its trust. If he fails, they will both be killed.