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A group of gangsters are kidnapping two boys: a son of a billionaire and a son of a USSR ambassador.

In Africa, monkeys fell ill. This news was reported to Dr. Aybolit by the monkey Chichi, who escaped from the robber Barmaley. Aybolit and his assistants — Chichi and the dog Avva — are in a hurry to save the monkeys from the disease. But Barmaley and his robbers are trying to stop them.

1918. After the death of the mother, the father decides to take the children to Moscow to see a distant relative. On the way, the guys experience a raid by a White Guard gang on a train, the death of their father, and meet the homeless child Yashka, who brings a plan to Lenin - how to destroy all the bourgeoisie and all the counter-propaganda in one day. The boys become involved in revolutionary events, and ahead is Moscow, a chance meeting and conversation with Lenin and Dzerzhinsky, the fight against counter-revolution...