Dasha Vasilyeva and Colonel Degtyarev were invited to the anniversary by their good friend Fyodor Mukhin. The guests walked on a grand scale, ate, drank, had fun, and enjoyed a concert with the participation of world pop stars. Mukhin, a rich man, is not at all greedy, he spends money easily. Yes, and a good person, perfectly treats Elena, the sister of his wife Svetlana. He loves Nina, the daughter of his sister-in-law from her first failed marriage, and does not deny her or his daughter Katya anything. Happy family, rich, successful. During the holiday, Svetlana becomes ill. So bad that they rush her to the hospital. There it turns out that the woman was poisoned! And this was clearly done by one of their own. Fedor categorically does not want to involve the police, he asks Degtyarev, who now owns a detective agency, to find the criminal. Well, how can tom cope without Dasha Vasilyeva? And, of course, Dasha will find the criminal, even if for this she will have to turn into ... an electrician!