Victoria, a former operative, is getting used to a normal life with her beloved husband, a psychologist. But after being attacked by a criminal in the service, she cannot have children. The couple decide to take six-year-old Dasha, whose parents died in a fire, to their place for the weekend. And then strange events begin to happen in their country house. The girl behaves secretly and sometimes aggressively, draws scary pictures and spoils toys. In her drawings, Vika guesses the victims of that same criminal, now she is absolutely sure: the villain is alive, and he is somewhere nearby.

There are different children in one ward: one has completely gone into the virtual reality world of computer games and decided that he has ceased to be a person and turned into a Creature. The second, through the fault of his stepfather, was carried away by the ideas of Nazism. The third, a boy from a prosperous family, no longer wanted to live and tried to step off the balcony. The fourth is just silent and hates everyone.

Eight-year-old Nina is an impulsive and emotional girl, quickly igniting ideas and dropping them halfway. Nina would probably have abandoned her new hobby - music - too, but a strange thing happened: the instrument began to behave defiantly, play by itself and provoke the hostess in every possible way. And soon Nina was completely kidnapped along with him. The villains plan to subjugate the world with the help of the piano.