1979. In a seaside town, in a fishing port, Mikhail Fedorov, an investigator of the OBKhSS, dies under mysterious circumstances. His best friend and colleague Alexander Kostenko learns that Fedorov's death was not an accident. He was about to take up the investigation himself, but suddenly, without explanation, he was suspended. In search of justice, Kostenko flies to Moscow for an appointment with the Prosecutor General. At Sheremetyevo Airport, he becomes an unwitting witness to the illegal transportation of a large amount in foreign currency. Vigilant Kostenko initiates the detention and arrest of the "currency courier" - a senior employee of the Ministry of Fisheries Arkady Lipman. With his professional acumen, rare integrity and meticulousness, Kostenko attracts the attention of not only the leadership of the General Prosecutor's Office of the USSR, but also party officials and the leadership of the Ministry of Fisheries, who are directly related to the currency scandal…