Xavier “Xavi” Lavezares was supposed to be a brilliant psychiatrist with a bright future ahead of him, until his sister Mara kills herself in front of him in the throes of a supposed demonic possession. Trying to find answers in a vocation he thought he’d never take up, Xavi becomes a man of the cloth who spends his spare time taking apart cases for exorcism. After the Vatican calls for an increase in the number of exorcists worldwide, Fr. Xavi is tapped to become to an exorcist.