Valentin Milyutin, suspected of organizing the contract murder of his business partner, has been released from custody. But as soon as the businessman left the walls of the detention center, he had to return to the detectives office: his wife Polina was killed right on the threshold of their apartment. At first, the investigation suspects Milyutin's son Anatoly, but his father has long since deprived him of his inheritance and he has no motive. Suddenly, a new person appears in the case - Milyutin's comrade in prison, a certain Ledogor.

Renowned neuropathologist Anna Fomicheva, who specializes in working with patients in a state of prolonged coma, was found dead in the pool where she regularly went swimming. It becomes known that Fomicheva developed a new treatment method using dangerous drugs. The husband of one of the patients was categorically against such experiments. Having studied in detail the woman's medical history, the investigation found that the heart attack, as a result of which she fell into a coma, was not an accident. Georgy and Irina managed to establish the motive - a million dollars.

The publisher Anatoly Shiryaev and his companion arrive at the house of the Usoltsevs and insistently demands a meeting with their adopted daughter Vera. Having received a reasonable refusal, Shiryaev threatens to sue. And soon in the park they find a burnt car with a burnt corpse of a publisher. Experts establish that the death occurred as a result of several severe blows to the head.