Exciting historical novel for young readers aged 12 and up by bestselling author Davide Morosinotto. "You must not lose each other!" their mother has warned the twins Nadja and Viktor. But in the crowded train station, they are torn apart. Viktor ends up in Siberia, where his journey back becomes a struggle against hunger and cold. Meanwhile, Nadja hides in a fortress, where the situation also escalates. Cut off from the outside world and without news of each other, the siblings desperately try to reunite.