Gabriel and Elias, two old friends tired of their misfortune, have decided to carry out a plan that will change the course of their lives, and will serve as a lesson to the man who personifies their frustrations: a successful and corrupt businessman that just married Sofía, Gabriel's former couple.
Investigando una masacre dentro de una escuela pública en la frontera de México y Estados Unidos, el agente Emmanuel Ritter encuentra que el extraño caso parece estar ligado a la llegada del antiguo demonio Belzebuth. Sin embargo, para detener esta ola de infanticidios, Ritter tendrá que enfrentarse a sí mismo antes de confrontar a las fuerzas del bien y del mal.
