The evening of meetings of school friends - former classmates of private detective Tatyana Ivanova - ended tragically. At the bottom of the pool in the sauna where the company was having fun, the corpse of one of the participants in the celebration was discovered - a well-known businessman in the city and a candidate for deputy of the City Duma. In connection with this, another classmate of Tatyana was arrested. At his request, the famous detective begins an investigation. The circle of suspects is narrow, and almost all of them are friends from school. Is the killer really one of them?..