AboutaweekaftertheWoodsfamilymoveintoXaosHouse,theirdaughterElliegoesmissingduringapowercut.Ellie'smotherKeirainvestigatesandfindsthatthewallshavestrangesymbolsengravedintothem.AfteranumberofterrifyingsupernaturalexperiencesshecomestotheconclusionthatthehousetookEllie.ShediscoversthataphysicistandoccultistcalledJohnFetherston,whowasobsessedwithfindingthe11thdimension,builtthehouseandengravedsinisterequationsonthe10stepsleadingintothecellar.Finally,Keiramustbattlewiththeuniverse’smostancientevil,orloseherfamily’ssoulsforever.