Martin Shchigelsky. Twelve-year-old Lukash goes to the dream vacation with his mother behind the blue door. On the way, they get into an accident, after which the boy is hospitalized, and later - his aunt, who lives in a small seaside town. Lukash cannot get used to his new life: he does not find common ground with his aunt or other children. He feels lonely and dreams of returning to his former life. Once Lukash accidentally discovers that the blue door in his aunt's boarding house leads to another world. Fabulously beautiful, mysterious and seemingly safe. But soon the guy will be convinced that this is not the case. Together with his former enemies, Rabbit, Monica and Blishka, he will have to save the world from the ugly Bloodsucker ...