Edith, accompanied by Mejía, goes to the Templo Mayor to investigate. Casasola and Quintana receive the whistle of what could be the new red note. In the Palace of the Archbishopric, a ceremonial knife appears, bloody, on an ancient bible.

In the early morning hours, subway guards see a mysterious figure enter the tunnels on the tracks. Reviewing the videos, Mondragón and Casasola come across The Sanctuary of the serial killer. Casasola is having nightmares controlled by the Witch.