The film is set in a pioneer camp. The pioneer Kostya Inochkin swum across the river without permission and ended up on a territory forbidden for visits, for which he was expelled by the head of the camp, Dynin. Not wanting to bring his grandmother to a heart attack by his early arrival, the boy returns to the camp and "goes into an illegal position", hiding under the stage-tribune. The pioneers secretly help him and are taking all measures to prevent the parental day that threatens the life of Kostya's grandmother.
The film is notable for its humor specific to pioneer camps, which made up a significant part of the cultural education of Soviet children, and is also full of social satire on the peculiarities of the Khrushchev era and life in the USSR of that period as a whole.
The film was shot in Aleksin, Tula region (pioneer camp of the Vorkutaugol trust) and in Tuapse (pioneer camp "Orlyonok").
Debut of Elem Klimov in a feature film.
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