February 1948. The struggle of decisive social forces for the heart of Europe.

The film thematically follows the stories of the TV series "30 cases of Major Zeman". We can meet Major Zeman again with Lieutenant Colonel Zitny, Major Hradec and Lieutenant Gajdoš. The film is set in 1972 in a South American country and shows the activities of an international counter-revolutionary headquarters, which the central character of the film - Major Hradec - uncovers even at the cost of his own life. The film was largely shot in Cuba. The film is an edited version of the series episodes 27 and 28 "Messages from an Unknown Land" and "Hostages in Bella Vista".

A group of saboteurs search for a weapons cache hidden by the Nazi army. Beskydy in the summer of 1950: the StB agent Borek infiltrates a group of saboteurs hidden in the Beskydy mountains. They are preparing terrorist actions against the ongoing collectivisation in the village. The group is led by Ervín Kopal and Metud Hanák. Borek is to make contact with them, secure the saboteurs and discover a weapons depot. After many dramatic events, the task is accomplished, but at the highest cost...

Pistolník is a teacher who rules the boys' boarding school of a vocational school with a firm hand. Room No. 135 is Pavel, Tonda, Roman, Slavek and especially Olin, nicknamed Koblih, five classmates who, with extraordinary imagination, drive Pistolník crazy with new and new Canadian pranks. Their recessions are only put to an end by the arrival of a new and young teacher, Kamila, who is not affected by their tried and tested tricks. Despite their seemingly carefree life, each of the boys has his own problems, which gradually surface, and so in the avalanche of funny moments, a serious tone is occasionally heard.