The Khrustal club was considered the best in the city. Matvey Abramov wanted to relax, have a drink and, if he was lucky, meet someone. But the evening did not go well, and he was going home alone when it turned out that a woman had been killed at Khrustal... Investigator Abramov had to join the investigation. And a week later, a man was killed in the same way, but not in a pretentious club, but in a recreation center for mechanical engineers, where evenings were held for those over thirty. These crimes are clearly connected, although the victims existed in different worlds... Or not?