Inhabitants of an elite Moscow house get involved in a game of a terrorist threatening to kill them one by one if they don't pay them a large amount of money.
After a long absence, surgeon Maxim Mikhailov returns to his hometown to help his mother, who is suspected of having an early stage of Alzheimer’s. He gets a job at a local hospital, and on the very first day faces a serious test to operate a patient with a severe brain trauma. Maximov saves the girl, but when transferred to the nearby regional hospital, she dies under suspicious circumstances. The doctor launches his own investigation and finds out the dark truth behind the young woman’s death. It is the first case in a series of medical and criminal mysteries he is going to solve throughout the series. Maksimov is a talented doctor and a passionate person, but his methods are both outrageous and admirable. He keeps saving people’s lives performing the most challenging surgeries but, as it turns out, not everyone is happy about it.
The year is 1953. Due to the mass amnesty, the criminal situation in the USSR is tense. At the same time, Ivan Astafyev, a former commander of a reconnaissance platoon, who was released from prison, returns to his hometown of Gorky. And immediately becomes a victim of an attack by bandits, and then a false accusation of beating the attackers. Ivan's pre—war acquaintance, Captain Shvedov, helps out of trouble, who gets him a job at the Dynamo sports society to train policemen in hand-to-hand combat.
Lera Valetskaya is a happy housewife who has completely devoted herself to her children and her beloved husband Victor, a police major. But what if she has to find out that her husband is not at all who he pretends to be? Illegal affairs and a double life - a young operative Gleb Smyslov helps Lera to see the true face of a loved one. A long-term marriage collapses overnight. Now they have to decide whether they are ready to remain a family and whether they will be able to stand together against the gangster group — friends from Victor's past life.