动作场面镜头剪辑凌厉，干净利落，不拖泥带水，每一次出击都力量感十足。AmericanpsychologistJohnHoldenarrivesinLondontoparticipateinasymposiumaimingtoexposewitchcraftanddevil-worshipasafraud,withattentioncenteredonacultrunbyaJulianKarswell.Debarkinghisplane,Holdenlearnsthatthesymposiumleader,HenryHarrington,hassuddenlydiedandheisnowincharge.WhatonlytheaudienceknowsisthatHarringtonwasclearlykilledbyademon,apparentlysummonedbyKarswelltoavengehispersecution.DespiteboththreateningandcajolingbehaviorbyKarswell,Holdendeterminestoproceed,thoughtheonlycultmemberwillingtotalkabouthisexperiencesisinaprisonpsychiatricward,catatonicafterallegedlykillingyetanothercultmember.However,Harrington'sniece,Joanna,believes,basedonheruncle'snotes,thatKarswellmayindeedhavesomesatanicpowersderivedfromanancienttomeinanobscurelanguagewhichhehasbeenabletotranslate,andattemptstowarntheskepticHolden.Karswell'smotheralsoattemptstowarnHoldenoff.However,thethingwhichbeginstomostgettoHoldenaretheoccasional,butmounting,sensoryandmentaldisturbanceshebeginsexperiencingafteranencounterwithKarswell,andthediscoverythat,duringthisencounter,KarswellsecretlyslippedaslipofparchmentwithacurseinrunicsymbolsonitintoHolden'sbelongings,aparchmentidenticaltooneHarringtonrecordedhavinghadpassedtohiminasimilarmannershortlybeforehisdeath...[N.B.HoldenatnopointstaysattheKarswellestate].