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Early20thcentury.Polinaarrivesatagirls'boardingschoolonamysteriousislandtofindhersisterwhodisappearedunderstrangecircumstances.Polina'sinvestigationiscomplicatednotonlybyconflictswithothergirlsandtheimperiousmentorZakharovabutalsobyastrangeobsessionthatdrivesthegirlsmad,oneafteranother.Polinaneedstofindoutwhathappenedtohersisterwithoutlosinghermindintheprocessandgetofftheislandwhichissinkingintheabyssofinsanity.