There has been a drastic increase in possessions across the country. Father Peter (Guy Pearce) a renowned exorcist is serving the church by overseeing trainee priests while they take the last step in their on-the-job training - identifying possession and learning the rites of exorcism. Father Daniel Garcia is Father Peter’s latest trainee. As the priests plunge deeper into hell on earth, the lines between good and evil blur, and their own demons emerge.