During the war, the German filtration camp "Nadezhda" was organized in the occupied territory, where experiments were conducted on children. Gemini is considered a special value – the most valuable material for experiments. And when one of the twins manages to escape from the camp, the Germans raise the alarm, trying to find the escaped boy. This makes life difficult for the residents of the nearest village, for the partisan group, and even for local policemen. In the center of the development of events is the life of little Petya and the touching love story of a young couple-police officer Andrey and the daughter of the headman Nina. Heroes repeatedly face the death of loved ones, confrontation, distrust and deception. Those who were friends yesterday become the most dangerous enemies, and those who would not have been given a hand yesterday will open up from a new side.