The main character, an official of the 14th grade, Erast Petrovich Fandorin, serves as a clerk in the Detective Department and secretly dreams of becoming a detective. By the will of circumstances, he finds himself involved in the investigation of a mysterious suicide.

The third film of the project about Cherkasov's task force is "Goznak". Based on another famous story - the robbery of the State Bank of the Armenian SSR in 1977, when the Kalachyan brothers swept the treasury for one and a half million rubles (two million dollars at the then exchange rate). It was the largest kidnapping in the Soviet Union. 1967 year. Moscow. A fashion model from the House of Fashion was killed. A group of Major Cherkasov arrives at the crime scene. He urgently introduces his man, Sonya Timofeeva, into the Fashion House, whose main task is to obtain information about the relationship between the employees of the Fashion House. Soon, another fashion model dies. And simultaneously with this murder, a very daring crime is taking place - the robbery of Goznak ...

1978. Cherkasov's group begins a new investigation: a young gamer Kira Miller and her lover Colonel Potapenko were killed at a dacha near Moscow. It turns out that shortly before her death, Kira lost 400 thousand rubles in a katrana - an underground casino. To find out all the circumstances of the case, Major Cherkasov decides to send Sonya Timofeeva to the katran. At the casino, Sonya meets Boris, nicknamed the Musician, who works there as a pianist. They have a whirlwind romance. But one day, in front of Sonya, Boris commits a crime. Realizing that she is in danger, he looks for a way to save her.

1975 - Cold War between the USSR and the USA, an arms race. Nuclear physicists are working hard. In the Soviet Union, a leak of classified information about the development of the Satan rocket is becoming apparent. It would seem, how can a police major be connected with the intelligence of the special services? However, it was he, Ivan Petrovich, dismissed from the Moscow Criminal Investigation Department, working as an ordinary precinct officer, who provided invaluable assistance to the KGB in the capture of an American spy.

A film adaptation of the novel by Agatha Christie, "The Murder of Roger Ackroyd." The owner of the mansion, Roger Ackroyd, was killed in his own office. The investigation is conducted by two - a local inspector and Belgian detective Hercule Poirot. Everyone is suspected: nephew, household, servants, guests. Everyone has an alibi and everyone conceals something, but at the same time hopes for Poirot and a fair outcome of the investigation. All but the true killer. But Poirot is not in a hurry, he patiently accumulates facts, gets rid of contradictions, frees everyone from a burdensome secret and remains face to face with the killer, facts, logic and a difficult human feeling - disappointment ...

Thirty short stories based on thirty stories by Chekhov.