La isla sagrada (Inspector Ryan, 1)

Lindisfarne—the legendary Holy Island, connected to the mainland by a causeway submerged by the tides twice a day—is home to a small, insular community where everyone knows one another. Detective Chief Inspector Ryan is there, temporarily on leave from duty. When a young woman’s lifeless body is discovered in the ruins of the ancient priory, Ryan takes charge of the case, despite his superiors' reservations. The investigation will uncover a dark underworld of drugs, manipulation, and a pagan cult that has managed to remain hidden within this ancient land.