Tragically ended a get-together evening of school friends—former classmates of private detective Tatyana Ivanova. At the bottom of a pool in a sauna where the company was having fun, they find the body of one of the guests—a well-known businessman in the city and a candidate for the City Council. As a result, another classmate of Tatyana is arrested. At Tatyana’s request, the famous detective begins an investigation. The circle of suspects is narrow, and almost all of them are friends from school. Could the murderer really be one of them?..