Best friends and mischievous third-graders Vasya Petrov and Petya Vasechkin, despite their differences, share a love for adventures. Romantic Vasya falls for his serious, excellent classmate Masha and writes her an anonymous love note. However, the quick-witted Masha identifies Vasya due to his errors and rejects him harshly. Upset, Vasya confides in Petya, who then devises a cunning plan to win Masha over.

In the first part, the students complain that classic works of literature have no bearing on modern life - and find themselves in a situation strangely resembling something they've read... It's Gogol's "Inspector General" - but set in a summer camp... In the second part, after reading Don Quixote, the ever-adventurous Vasechkin convinces more cautious Petrov that he has found a game that they could play for life. No sooner they go off than Vasechkin, on a bike, brandishing an umbrella, attacks a giant... That is, a windmill...