Private detective Vasily Makarovich Kulikov and his faithful assistant Vasilisa are able to solve any crime - return stolen jewelry, find the thief, unravel the knot of mysterious murders. Therefore, a new business - spying on the customer's mother-in-law - at first seems like a piece of cake. The son-in-law suspects that between visits to the beautician, hairdresser and fitness center, his beloved relative is having an affair with a handsome young man, thereby setting a bad example for his daughter and casting a shadow on the whole family. However, in the process of surveillance it turns out that the elderly lady is not as harmless as might seem at first glance. As a result, events take an exciting and even dangerous turn... The book was also published under the title “I will love you to the grave.”