A killer known as "The Decapitator" terrorizes the city and leaves victims with a clear pattern: they were all murdered with an Arabic knife in a brutal attack to the jugular. UNIC investigates with no solid leads until the Prosecutor, father of detective Sofía Solabeth, is linked to the crime scenes. While the evidence points towards him, Sofía is convinced that he is being incriminated and investigates on her own. She discovers a connection with Arturo Pimentel, a man with dark ties to the victims. The truth reveals a plot of revenge and justice in a corrupt system and forces Sofía to make decisions that will change her life.