Amanwakesinanemptysuburbanhousewithnomemoryandbloodsmearedonhisarm.Ashefranticallywashesofftheblood,hediscoversthatitisnothis.Hefindsstickynotesaroundthehousethatread:"Don'tstayinthisroom.""Don'tgooutside.""Don'tgodownstairs."Confused,hetriestofollowthecrypticmessages,ultimatelydiscoveringtwothings.Memoriesofamotheranddaughterthatheissomehowconnectedwith,andalsoademonicpresencelivinginthissuburbanhouse.Ashegetsclosertosolvingthemysteryofwhyheisthere,thedemongrowsstronger,testinghiswilltosurvive.