A dangerous patient escapes from a specialized psychiatric clinic — a former Soviet intelligence officer and traitor named Tsventukh. Once free, he begins to take revenge on Matveev, the man who put him behind bars. After losing first his wife, then his friends, Matveev realizes that from now on, he can rely only on himself.

On Belgian territory, a unique emitter is being developed under the supervision of a Russian scientist. The lives of many are at risk, as the device can disable any mechanism running on liquid fuel. Matveev must track down the international terrorists to prevent a catastrophe...

The international terrorist organization Al-Qaeda is hunting for the latest developments by Russian nuclear scientists. The terrorists plan to obtain blueprints for a nuclear mini-bomb, unlike anything else in the world. To achieve this, a certain Mahmoud is sent to Moscow. He intends to enlist the help of his longtime agent Mikhail, who has ties to the Nuclear Research Center.

A Russian man Sergey Matveev is sent on a business trip to New York to deliver an important package to a local businessman. As soon as he arrives in a hotel, he finds himself entrapped by the FBI. They know he used to be a GRU agent and threaten to imprison him if he would not reveal the secret information regarding "the mole". But Matveev escapes right from the hotel room and finds himself on the streets of an unknown city and enters New York city subway to hide away from the FBI. On his way home, he would have to face greedy federal agents and local criminal gangs.

Retired Colonel Matveev takes on an unofficial assignment to revenge his friend's death and catch one of the most dangerous terrorists who managed to escape to America during a failed operation in Chechnya.

CIA and MI-6 agents are hunting the top secret list of GRU agents, infiltrated in CIA 12 years ago during the operation "Blueberry Pie". They come to Moscow with intention to find colonel Matveev, who participated in that operation.

The seasoned intelligence officer still can’t enjoy a peaceful life. A call from a former colleague pulls Matveev back into action. Oleg Uralsky warns him of a looming threat and reveals that people connected to Operation 'Gambit' are being eliminated. It’s possible that Uralsky himself could be the next target.

A daring assassination attempt is made on a prominent businessman and public figure. As the investigation unfolds, it becomes clear that a deeply covert militant organization is operating in the country, made up of intelligence agency personnel. Matveev's old friend, General Sokolovsky, asks him to infiltrate the organization.

Matveev, a former illegal GRU agent in the U.S., and his wife arrive at a Turkish ski resort posing as ordinary tourists. There, they are supposed to meet with one of the Russian sleeper agents. But the CIA sets up a provocation against Matveev.

Military journalist Igor Vladimirov turns to his longtime friend — intelligence colonel Sergey Matveev — for help. Fifteen years have passed since they last met. A quarrel over a woman named Zhenya, whom Igor eventually married, drove them apart. Reluctantly, Matveev agrees to let go of past grievances and visit Vladimirov at his country house.