In December 1941. For five days from the front line in besieged Leningrad arrives for re-forming company. The soldiers are placed in barracks outside the city. A young soldier Alexei Kazantsev pays attention to the girl Olya. She comes to the barracks every day to see her father, Private Koshkin, who among the St. Petersburg volunteers is going to go to the front. Olya is sick, and from hunger she can hardly stand on her feet. Koshkin gives her his tiny ration, which is given to soldiers. Alexei meets Olga and does his best to save the girl. On the eve of Alexei's return to the front, Olga becomes his wife.

Professor Gromov constructs a robot called Electronic, which looks exactly like Sergey Syroezhkibn, a 6-grader from one of Odessa (USSR) schools. The robot also acts a lot like a human, and its dream is to become a real man. Electronic escapes from the professor's lab and accidentally meets Sergey, his prototype. Meanwhile, a gang lead by Stump is trying to kidnap Electronic to make him steal pictures from museums. For this purpose they send their hitman Urrie.