After the partisans Julia, Pavel and Sergei went out on a combat mission, the detachment was surrounded and destroyed by punishers. Years later, a document was discovered stating that one of the three was a traitor.
The film was based on the story of the same name by A. Yakovlev about the most famous pioneer of the thirties of the last century, who was inscribed in the history of the pioneers under number 1.
