A rural police officer investigates a strange case in which a woman is found headless. The main suspect puts the blame on a legendary monster.

Rural police officer Cruz investigates the bizarre case of a headless woman's body found in a remote region by the Andes Mountains. David, the husband of Cruz's lover Francisca, becomes the prime suspect and is sent to a local mental hospital. David blames the crime to the inexplicable and brutal appearance of the "Monster." Cruz stumbles on a mysterious theory involving geometric landscapes, mountain motorcyclists and a mantra stuck in his head: Murder Me, Monster.