Formula of revenge

In the new season, Ivan Petrovich Cherkasov, as always, is busy investigating a complex and confusing case. An architectural student was thrown from the roof. His mother committed suicide. The tracks lead to the hippodrome where the jockey died. And on the outskirts they find the corpse of one of the attendants of the racetrack. The suspects are residents of an elite house, cultural figures. Among them are a singer, a fashion designer, and famous actors who often visit the hippodrome. Cherkasov guesses that the criminal is one of them. Ivan Petrovich quite quickly goes out to the perpetrators of the murders, but there is also a certain organizer of the crimes, who cannot be figured out.