Captain Aglaya Mezentseva of the Ministry of Internal Affairs and investigator Vsevolod Kosinsky, one of the best specialists in the search for children, are solving the case of the missing 5-year-old grandson of the world-famous conductor Mark Krechetov. The child mysteriously disappeared during a walk with a nanny, and the woman herself was hit on the head and lost her memory. Literally all members of the Krechetov family are under suspicion, and Kosinsky does not spare anyone in order to achieve the result. Aglaya does not accept Kosinsky's methods, but nevertheless becomes his best student. The more Aglaya unravels the tangle of complicated family relationships and financial machinations in the Krechetov family, the more she has to sacrifice — her peace of mind, her career, the lives and feelings of others. And even put her unborn child at risk.