A family movie about a friendship between girl and dog.
Film-makers come to a Soviet secondary school to shoot the advanced 9 "A" class. 9 "A" class under the leadership of a young teacher Klavdia Sergeevna on all indicators came out on top. But this well-being was based on showmanship and snitching. Gradually, the conflict between the class teacher and students grew into a real war. So who is the tuning fork for whom?...
The Soviet command has alarming information about the new invention of the enemy. According to intelligence, the Nazis delivered a batch of new chemical shells filled with gas of tremendous destructive power to one of the sections of the Eastern Front. The Nazis want to test them in combat conditions, and then apply them on a large scale.
