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.
Lucas travels to visit his sister who lives in Niebla, a remote town in southern Chile. Beside the ocean shrouded in the wintry mist, he meets Antonio who works as a boatswain in a local fishing boat. An intense romance blossoms between the two of them, and with it their strength, their independence and their adulthood become immovable with the ebb and flow of the tide.