Teen horror drama in which a group of wayward yet uniformly attractive girls are sent to a reformatory set in an abandoned church where they do battle with a demon. St Marks' catholic school for girls has recently reopened as a spiritual boot camp after being closed 13 years ago due to the mysterious disappearance of a student. The prison-like atmosphere does its best to avoid welcoming five new faces that, in time, discover they have supernatural talent previously untapped. The villainous Father Drake (Ron Perlman) is ever at their elbow along with his henchwoman Headmistress Pearce (Amy Ciupak Lalonde). After their individual escape attempts fail even using their powers, they discover there is a malevolent force abroad, keeping them in the maw of St. Marks. They decide to join forces and unleash their mighty combined power upon the dark force 'Legion' but it's not as easy as it looks.