Sofia is sent to St. Mary's, a creepy Catholic boarding school in Mississippi. There, seemingly everyone is doing penance for something, most of all the mysterious Jude, for whom Sofia can't help feeling an unshakeable attraction. But when Sofia and Jude confide in each other about their pasts, something flips in him. He becomes convinced that Sofia is possessed by the devil. . . . Is an exorcism the only way to save her eternal soul?