The young soldier Vasily Lemekhov has returned from the hospital and met a young woman Natasha in Chisinau.

Forty-year-old researcher Pavel is still single. And not because he likes to be free and unmarried, but because he is very indecisive - he does not know how to meet girls. Pavel’s parents are sounding the alarm - they really want to give their son "in good hands" and see their grandchildren. But he doesn’t like those girls whom Pavel’s mother is wooing. And then one day a master takes over - a cheerful, battered and excessively sociable brother of Pavel — Gennady. He has in his arsenal one effective way to get acquainted with any girl he likes, to interest her in his persona. Gennady is getting into a rage so much that he almost gets married, forgetting about the watchful wife, who always stands guard over their long marriage...

The film plays one of a little-known pages of the biography of Arkady Gaidar, the young man when he was appointed commander of the detachment CHON (special-purpose parts)...