Irreverent Heresy

Marcos is a man who has been buying and selling objects for many years.
His brother-in-law, Ramón, is a detective who works with the police; He usually brings things that he finds interesting during searches and raids, then Marcos dedicates himself to valuing said material and finding potential buyers.
But everything changed when Ramón gave Marcos a grimoire belonging to the late Madame del Aquelarre.