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.

Maria Alexandrovna, a teacher in a boarding school, is already under forty, and now she finally gets the opportunity to arrange her personal life. But the person with whom she wants to connect her life lives far away, and she will have to part with her sixth grade - the children with whom she replaced her parents. Children behave differently in this difficult situation - from altruism to inner protest and even risking their lives in order to keep their beloved teacher ...

The girl and the animals dream of warmth, but winter does not plan to leave yet.