Students of the 5th "B" class were awarded a movie camera for the first place in collecting waste paper. Anton Dudkin was assigned to shoot a chronicle of the life of the class. As a result of all the funny stories that happened to the guys during the filming, they decided to scrap the "dangerous prize" — the movie camera.

At the peak of the harvesting season, when there is a shortage of machinery and the new one needed adjustment, the chairman of the collective farm entrusts the combine harvesters to the Steppe Squadron of high school students. Only two of them run away from the hard work, the rest carry the labor watch under Sergey Lotarev till the very end with honor. Having learned that his favorite girl betrayed him and began to openly accept the advances of a visiting student, Lotarev decides to leave for the city, but suddenly a hurricane struck the village - and the hero rushes to the aid of his underaged brigade....

Five stolen doves "monks" are helping to investigate a big diamonds theft.