Pioneer Kostya Inochkin, while in a pioneer camp, swam across the river and found himself in a forbidden territory, for which he was expelled by his superior, Comrade Melon. Not wanting to bring his grandmother to a heart attack by his early arrival, the boy secretly returns to the camp, where the pioneers also secretly keep him and take all measures to prevent a parent's day from taking place. After all, it is on this day that Kostya's grandmother will show up at the camp... Actors: Arina Aleynikova, Lidia Volkova, Yura Bondarenko, Ekaterina Mazurova, Viktor Kosykh, Lidia Smirnova, Ilya Rutberg, Nina Shatskaya, Tatyana Barysheva, Evgeny Evstigneev, Alexey Smirnov