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...