Exciting historical novel for young people from the age of 12 by bestselling author Davide Morosinotto. You must not lose each other!, the mother has inculcated the twins Nadja and Viktor. But in the crowded station they are torn apart. Viktor's going to Siberia. For him, the way back becomes a fight against hunger and cold. Meanwhile Nadja is hiding in a fortress, where the situation is also getting worse. Cut off from the outside world and without news from each other, the siblings desperately try to find each other again.