Lyuba lives a quiet life and is raising a granddaughter, who is not needed by her model daughter and son-in-law. He already has four adult children from his first marriage. But when attempts on these children begin, Lyuba takes up the investigation. After all, danger threatens little Lizonka too! Where did her son-in-law Oleg get himself into? Perhaps the matter has something to do with his first wife, a ballerina, now locked in an elite psychiatric hospital? Or with the first mother-in-law who emigrated from the country? During the investigation, many family secrets of Oleg Stupnikov come to light. It turns out that his daughter was hiding an illegitimate child from everyone, and his son had an affair with his father’s second wife. To top it all off, Lyuba herself suddenly decides to get married - no less than one of her son-in-law’s main competitors...