In the Avin family there was a tradition: when the adopted children grew up, they would take in new ones for upbringing. And one day a Creature appeared in the house. It knows how to hide, how to evoke pity, how to manipulate anyone who crosses its path. The Creature stays beyond suspicion. Only Nikita, the eldest son of the Avins, suspects that the Creature is not human. It hunts, and if it isn’t unmasked, it will deal with its new guardians the same way it dealt with other families.