After years of eliciting money from desperate believers, charismatic preacher Reverend Cotton Marcus decides to reveal his fraudulence by documenting one last "exorcism" performed on another disturbed religious fanatic. But after he and a film crew arrive at the Sweetzer farm, Marcus encounters a horrific scene beyond his wildest imaginings: a blood-drenched farmhouse with a teenaged girl held in the grip of true evil. Now, Marcus must find a way to save the girl and stop the terror - or die trying.