Family troubles, reproaches from acquaintances for stupidity and inability to live, illness of children, death of his wife brought Kirill Kiselnikov down. Flattered by a bribe, he commits a forgery. Betrayal of ideals is costly: the unfortunate person loses his mind. And that is not all…

The teenager Misha Polyakov, being with his mother in a Ukrainian village on vacation with his grandmother and about to return home to Petrograd, offers his best friend Genka to go with him. Suddenly, a white gang of Nikitsky bursts into the village and attacks Misha’s house, where Commissioner Polevoy lives. The purpose of Nikitskiy (aka Nikolskiy) is a dagger located at Polevoy. Saving the commissioner, Misha learns from him the history and secret of the weapon, and receives it for storage with a request to solve the secret. Having returned with adventures to Petrograd, Misha Polyakov with friends begins to unravel the riddle of the dagger, in the handle of which is encrypted text.

In the short-lived Commune of Paris, a conscripted soldier falls in love with a Communard saleswoman. As the army cracks down on the revolutionaries, the soldier is forced to fight against the Commune, and the pair's love is put to the test.

Schoolboy Petya Ivanov receives a letter from a famous scientist and 20 grains of a new high-yield variety of wheat. Petya and his schoolmates decide to create an experimental plot. Fearing that adults will take the seeds away from them, the children do everything in secret.

A biography drama about Sergey Kirov, a prominent early Bolshevik leader in the Soviet Union.