In a cold January evening, Caraoscura wanders around the streets of a secluded village. Little Carla awakes scared. Lucas, her older brother, tries to calm her and convince her that Caraoscura isn't real, but little did they know that the story conceals a a reality so terrifying that they never imagined before.

A secret unit of cops is assembled to stop a terrorist band from attacking Spain after their leader is arrested there.