Distraught and unemployed, Julio changes his identity and joins the police force as a psychologist were he later discovers that a group known as The Brotherhood was behind the murder of his wife and daughter. After making this discovery, the new bloodthirsty Julio tracks down those responsible and leads them to their deaths through the use of mind games.
Tres jóvenes comparten piso en Madrid: Javi, Chemita (amigos desde nios) y Luna (la prima de Chemita). Un fin de semana deciden hacer una fiesta, y enseguida se apuntan Carmelo, el novio de Luna (un garrulo de libro) y Tripi, ex compaero de piso de Chemita y Javi. Lo que ninguno adivina es que ese fin de semana les sucederán un montón de cosas y nada volverá a ser como antes....