Episode list

Soviet intelligence officers are faced with a difficult and dangerous task - to urgently identify a CIA agent living in Moscow and working in an institution where all information on the "African Knot" is received. The fate of not only individuals, but also the whole state - the African country of Nagonia - depends on the promptness of solving this problem.

KGB Colonel Slavin is sent to the African city of Louisbourg "undercover". Here he begins his investigation into the authorship of the letter to the Soviet embassy and finds out that it is someone Ivan Belew. In Moscow, the Soviet trade representative in Louisbourg Zotov, his ex-wife Olga Vinter and Ph.D. in economics Dubov fall under suspicion.

With the help of Moscow, Slavin learns that Ivan Belew is a former Soviet citizen, Ivan Beliy. The Colonel manages to persuade him to cooperate, but Belew dies under mysterious circumstances. In Louisbourg, Slavin met American journalist Paul Dick and businessman John Glabb.

John Glabb, who is a CIA agent, is going to pull off an operation to support General Agamo, an opponent of President Nagonia. Colonel Slavin is detained by the police under a fictitious pretext. Spy suspects continue to be monitored in Moscow.

John Glabb deploys a cover operation for Trianon and tries to expose Zotov under attack, compromising him before the authorities of Louisbourg as an American agent. The Soviet writer Stepanov, who writes about Nazi criminals, joins the investigation. Olga Winter tragically dies in Moscow.

After the examination, it turns out that Olga Winter was poisoned. Dubov falls under direct suspicion. KGB officers begin to suspect Dubov of Olga's murder. Surveillance of him shows that he is exchanging messages with an employee of the American embassy. In Louisbourg, Zotov's apartment is searched by the local police, as a result of which Zotov is wounded.

Slavin studies Glabb's biography and finds out that John Glabb, as a deputy resident of the CIA, often used his position in the US intelligence services to organize the production of drugs on an industrial scale and transport them around the world. Slavin deliberately reveals "his cards" to Glabb, showing that he knows about his past and work in the CIA. Stepanov's article about the events in Nagonia confuses Glabb's plans.

Glabb suspects Slavin in the murder and lays a trap for him. Slavin ends up in jail. Meanwhile, in Moscow, the KGB decides to arrest Dubov. During the arrest, Dubov poisoned himself. Security officials have done everything to prevent the leakage of this information.

Journalist Paul Dick defended Slavin on local television. Slavin is under pressure in prison - Glabb is trying to convert him. In order to reach his contact from the embassy, the KGB uses a disguised employee and also Dubov's girlfriend, Olga Vronskaya.

By blackmailing Glabb, Slavin forces him to delay the military coup operation in Nagonia. Having convinced the Americans that Trianon is alive and active, the KGB manages to lure the cultural attache of the US Embassy (he is also a CIA officer Luns) to transfer the container with materials, where he is detained. Red-handed Luns forces the CIA to abandon the military coup.