A murder, monstrous in its cruelty and senselessness, takes place in a city industrial zone. Vorontsov, an experienced operator, reluctantly takes on this matter, sensing evil. And his premonitions are justified: in a brick tower, not far from the scene of the murder, Vorontsov discovers a strange lair and a huge Doberman, and a forensic expert establishes that the murder weapon was a carpenter's saw... But Vorontsov does not guess everything: he does not know that a homeless teenage girl, which he sheltered out of pity, is somehow connected with who committed this murder... So what happened on the outskirts of the city? Is a person capable of committing such a murder that has no logical explanation? Or was it not a person?..Vorontsov returns to the tower, and the murders are repeated again. Now he must become the next victim...