Exorcism is a greying profession. Most still casting out demonic possession are no longer in their salad days. As supply outstripped demand, Reverend Bob Larson came up with an idea to solve the problem. He trained teenage girls as exorcists, saying that they can be particularly effective. Using the bible, the cross, holy water and their new found skills, they cast out demons wherever and whenever they are needed. These teens, however, are not fans of Harry Potter and Twilight. To them it is the work of the devil.