When he arrives on the rural Louisiana farm of Louis Sweetzer, the reverend Cotton Marcus expects to perform just another routine "exorcism" on a disturbed religious fanatic. An earnest fundamentalist, Sweetzer has contacted the charismatic preacher as a last resort, certain his teenage daughter Nell is possessed by a demon who must be exorcized before their terrifying ordeal ends in unimaginable tragedy.   The Last Exorcism is written by Huck Botko and Andrew Garland and directed by Daniel Stamm. Eli Roth, Strike Entertainment and Studiocanal present an Arcade Pictures Production.