Sister Ann, who devoutly believes that performing exorcisms is her calling, despite the fact that historically only priests--not sisters--are allowed to perform them. When one professor senses her special gift, allowing her to be the first nun to study and master the ritual, her own soul will be in danger as the demonic forces she battles reveal a mysterious connection to her traumatic past.
Sister Ann, who believes performing exorcisms is her calling, but is at odds with a exorcism school's rules and eventually comes face to face with a demonic force that infests the school and has mysterious ties to her own past.