OnaremoteislandoffthewestcoastofScotlandin1846aheavystormhits,causingashiptosink.Threesurvivorsrowthroughathickearlymorningmist,lostanddisorientated.ThemistbeginstoclearandTheIsleappearsbeforethem.Theysoondiscoverthatitisalmostabandonedexceptforfoursoleresidents:anoldharbourman,afarmer,hisnieceandayoungmadwoman.Oncerestedandrecoveredthesailorsaredesperatetoleaveandreturntothemainland,butthepromisedboatneverappears.Oneofthemstartstoinvestigateandlearnsofatragedyatseathatoccurredfiveyearspreviouslycausingseveralyoungmenfromtheislandtoperish.Whenhistwoshipmatesmeetwithaccidents,themythofaghostlysirenhauntingtheislandleadshimtouncoverthetruthwhilsthebattlestosavehisownlife.