Valery Tarkovsky was killed quickly and in cold blood. The killer was clearly trying to make it clear that Tarkovsky was not such a good specialist. The martial arts master simply received a fatal blow with a knife. Private detective Tatyana Ivanova, investigating the murder of a martial arts coach, finds out that Tarkovsky was a very loving man and did not hesitate to have affairs with his students. Could this have something to do with his death? And the detective, apparently, has already gotten close to the criminal or criminal. The attack was unexpected and swift and almost cost Tatyana her life...