Composer Peter Harper, reeling from divorce, retreats to an isolated Irish beach house hoping to find inspiration. The secluded Tremore Beach cottage seems perfect until a raging storm hits on a fateful night, upending his plans.

Toledo, Spain, 1997. The residents of Río Blanco have accepted the settlement of Moroccan seasonal workers in Fuensanta. Coexistence brings tensions, known by Sonia, an NGO leader; Father Ángel, the local priest; and Safir, the imam. What they don't imagine is that Fuensanta's foundations hide something capable of unleashing their worst nightmares, regardless of their beliefs or prayers.