SuburbanAmericagonehaywire.Inthemidstofaserialabductor/killer'srampage,abeautifulyoungteen,RileyLawson,goesmissing.Whenherdesperateparents,WillandKate,arecontactedbyherkidnapper,aninsufferableFBISpecialAgenttakeschargeofthecase.But,fromdeepwithinthepsychopathicsubterraneanworldcreatedbyOtis,Rileyturnsthetablesonhertormentor,managestoescapeandtocontactherparents.And,fedupwiththetragi-icinabilityoftheFBItofindtheirgirl,Will,Kate,andRiley'sbrother,Reeddecidetotakematters-andjustice-intotheirownhands.ButwhenOtis'sbrother,Elmo,showsupunexpectedly,theLawsonsfindthemselvesmiredinunusualandmacabreconsequencesofvigilantism.