Reverend Cotton Marcus is a fourth generation evangelical minister, a well-known practitioner of exorcism, with many faithful believers in his work - Only he"s not one of them. People believe what they need to believe, and Cotton has helped many lost souls work out their "demons," but in the twilight of his career he decides it"s time to put away the smoke and mirrors reveal the truth by allowing a film crew to capture the secrets of his trade in his final exorcism. Cotton"s last case takes him into the rural Louisiana, to the home of Louis Sweetzer, a simple farmer and a devout fundamentalist, convinced he has a demon on his hands. Strange things have been happening on Louis"s farm. His livestock butchered during the night, their bloody carcasses left to rot. By morning, Louis"s only daughter, Ashley, apparently a sweet innocent, provides the only clue to the killings: she wakes up covered in blood. Reverend Marcus prepares for his final performance, the exorcism of Ashley Sweetzer. But to his horror, he soon discovers that he will need to conjure much more than a charade to put his last demon to rest...