S1.E531 ∙ Episode #1.531

Nikolay, a young aristocrat, joins the detective police against societal norms. Mentored by veteran Shchukin, they investigate a string of enigmatic crimes spanning the city's slums and elite circles.

1978 year. The group of Major Ivan Petrovich Cherkasov begins a new investigation: a young gambler Kira Miller and her lover, Interior Ministry Colonel Potapenko, were killed at a dacha outside Moscow. It turns out that shortly before her death, Kira lost four hundred thousand rubles in an underground casino - "katrana". To find out all the circumstances of the case, Cherkasov decides to put Sonya Timofeeva at the gambling table. Her task is to get into the trust of the regulars of the katran and collect the information necessary for the investigation. At the casino, Sonya meets the pianist Boris, nicknamed the Musician, and the owner of the katran, Bella. At first, Sonya is lucky in cards, there is excitement. She has an affair with the Musician. Sonya does not have time to look back, as she is too keen on the bohemian life and wallows in debt ... Cherkasov worries about his ward.

Yaroslavl 1975. Two high-profile crimes in one day. A mentally ill physicist cuts off his neighbor's head and brings it to the police, and a body is found in the basement of an apartment building a criminal killed by an awl in the ear. An uncompromising investigator for especially important cases of the prosecutor's office, Egor Tabolin, enters into a duel with an elusive killer, to whom the threads of both cases lead. His enemy is cunning, treacherous and omnipotent. With the help of blackmail, he managed to subjugate the most influential people in the city. The KGB is behind him. But investigator Tabolin will not step aside. He seeks the "ultimate measure" of justice for the victims, and the "ultimate measure" of punishment for the violent criminal.

A collection of short stories that mark pivotal moments in different people's lives, each story is told in three shots.

The final part of the trilogy of the Moscow criminal department led by Major Ivan Cherkasov investigating the case of maniac - murderer with machine gun.

Holmes and Dr. Watson help a young lady who is receiving anonymous letters 10 years after her father passed away under shady circumstances. They find themselves in an enigma involving a treasure, murder and a love interest for Watson.