There is a war. In occupied Ukraine, the fascists fiercely suppress any centers of resistance among the civilian population, but now young people are joining the fight against the invaders. In the town of Malin, Zhytomyr Region, Nina Sosnina and her friends create an underground cell. Yesterday they were schoolchildren, and today they are carrying out subversive work, not allowing the Germans to rest. The brave Nina establishes communication with the partisans and becomes for her comrades a real Combat Commander, but now the Nazis are real hunt for them and every minute they risk their lives ...