Sixteen-year-oldVivienistrappedinTheVestalisAcademy,aprison-likeboardingschool,keepingtoherselfandstickingherneckoutfornoone.UntilsheisreunitedwithSophia--theformerfriendwhobetrayedher.Togetherthegirlsembarkonadangeroussearchtouncoverthehorrifyingtruthbehindtheirimprisonment.Soonrunningfortheirlives,thegirlsmustsavethemselvesordietrying.