In the autumn of 1944, twin sisters Stasia and Pearl arrive at Auschwitz together with their mother and grandfather. In the hell of the concentration camp, the twelve-year-old girls find salvation in a secret language, secret games, and an astonishing reserve of inner strength. Having become test subjects of Dr. Mengele in the camp block known as the “Zoo,” they receive certain privileges—but what are such indulgences compared with torments and horrors unknown to others? Even the cruellest hand of fate proves powerless to separate the twins…