Hogwarts is in turmoil when Sarah Spellman returns for her 6th year; their treacherous Defense Against the Dark Arts teacher is on the loose, her friends are struggling with the traumatic events of the year before, and the last cursed vault has been opened, turning unsuspecting students and staff into stone. Sarah must work with Mad-Eye Moody to stop the evil wizarding cabal known as "R" and close the last vault before she loses those she loves the most...if its not already too late.