MildredreturnstoMs.Cackle'sacademywiththehopesofabetteryear;butwhenhersummerholidayprojectisstolenshehastoproveshedidn'tmakeitup.Meanwhile,agroupoffirstyearsdiscoverasecretinatree.Plusadiscoveryintheschool'sruinsspellshopeandtroubleforeveryone