The main character of the series, forty-year-old Colonel Yuri Ivanovich Bragin (Ivan Kolesnikov) returns to St. Petersburg, from a business trip to one of the major Russian regions, where he was sent as part of an investigative team to investigate a certain «high-profile case». This business trip lasted for a year. Bragin and his colleagues managed to prove a criminal connection between the leader of a large organized crime group and local officials. An attempt was made on Bragin. Only by a miracle did he stay alive.

Bragin returns to St. Petersburg, where he learns that the current head of the First Investigative Department of the First Directorate of the GSU, Vadim Maltsev (Ilya Shakunov), is retiring. It is more likely that Bragin will be offered to take his place. But for now, Bragin is urgently sent on another business trip. This time to the Leningrad region. In one of the cities of the Leningrad region, two girls were killed by an unidentified person a week apart. This town is small, you can say that all the inhabitants are in plain sight of each other. Which complicates the search for the killer…

 Bragin is not a careerist. The boss’s chair is not an end in itself for him. A talented investigator likes to do «live work» more. Bragin seems to «collect» the features of many famous literary detectives, from Sherlock Holmes to Hercule Poirot. Actually, colleagues call Bragin Poirot behind his back. Yuri Ivanovich tries to personally travel with the operas of the criminal investigation department to detain dangerous criminals, he can personally sit in ambush and, although his colleagues from the police do not like it (everyone has to do their job), they respect Bragin for this.  Bragin’s longtime friend, police Lieutenant Colonel Mikhail Shibanov (Sergey Zharkov), is ready at any moment to come to his rescue and help with friendly advice, which refutes the theory that friendship between an investigator and an operative is impossible in reality.