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.

There is a serious emergency in the optics store - the seller was shot. An advertising stand with the logo of Vision Style, a company specializing in eye color changing, was found near the body. It all looks as if someone deliberately put her next to the corpse after the murder. From the vice president of the company, Georgy and Irina learn that he recently received a letter with threats and accusations of devilish change in people's appearance. Investigators realize they are dealing with a paranoid fearful of someone with an altered appearance.