InbooktwooftheTimeoutofTimeseries,theexcitementandmysterycontinueasTimothy;hissister,Sarah;andtheirfriend,Jessica,journeytoEdinburgh,Scotland,wheretheyseektheFourTreasures,especiallytheTellingStone.TheymustkeepthetreasuresfromfallingintothehandsofBalor,whowillusethemtodeprivetheworldofgood.ThechildrenpassthroughTimeoutofTimeastheyundertaketheirquest,encounteringmythicandfolkloriccharacters,includingtheTuathaDéDanann,Gwydon,andCerridwyn.AcodehiddeninanancientmapisthekeytofindingtheTellingStone.Thebookincludesafour-colormapandconcludeswithaglossaryofthemanyhistorical,literary,andfolkloricreferencesmentionedinboththisandthefirstTimeoutofTimevolume.