Margarita Sergeyevna Krulevskaya, along with her “investigators,” returns to her hometown. However, instead of finally searching for the missing little dogs and cats of wealthy clients, as well as the traditional hunt for unfaithful husbands and wives, she and her faithful friends will have to unravel another high-profile case. This time, they need to find out the reason for the sudden passing of perfectly harmless old people—old men and old women alike.