After leaving the hospital, Sergeant Katsuba, who has bid farewell to frontline service, travels to a provincial town to teach military science to cadets. However, his relationship with the 17-year-old boys does not go well: they consider their instructor to be unfair and overly critical...

This is a last of 3 movies about 3 friends (the other two are "Kortik" and "Bronzovaya Ptitsa"). The gang has grown up and in this movie they discover and help to stop criminal activity on the factory and in their neighborhood.

After a story of Tamara Tinberg, "Seventh Symphony". The Leningrad block. February 1942. Ends the worst blockade winter. Nina Voronova completely desperate. Her three-year-old son, Mitya, has weakened, and the ration cards have already been delivered two qigou.cc days in advance. Last hope - evacuation. But with small children do not take. Then the woman goes to a monstrous step - is evacuated, leaving her son alone in a frozen apartment. During the raid, the boy is saved by a teenage girl Katya Nikonorova. The girl gives Mitya for her brother and promises herself to do everything so that Mitya survived. No matter what.