Exorcismo en Ferrolterra, a crime thriller from Rober H.L. Cagiao's "El Guardián de las Flores" series, follows Comisario Paula Cid investigating dark, ritual-like crimes in Galicia. The novel merges police procedure with local folklore and psychological horror, focusing on the team's search for a potential religious fanatic or calculated killer. It features a, fast-paced, cinematic writing style that highlights the atmosphere of the Ferrolterra region.