NewYorkprivatedetectiveDuncanMacMacLainisblindbuthaskeenlydevelopedallhisothersenses.HepursueshisworkassistedbyhisfaithfulguidedogFriday,hisbutler,Alistair,andhisassistant,Marty.RetiredactressNormaLawry,anoldfriend,comestoMacseekingadvice.Herheadstrong17-year-oldstep-daughterBarbara,herselfapromisingactress,isenamoredwithherleadingmaninasmalltheaterproduction,themucholderLotharioPaulGerente.Paul,whohadoncebeenNorma'slover,hasconvincedBarbarathatNormaactuallywantsPaulforherselfandhasonlymarriedherfatherStephenforhismoney.AtMac'surging,NormatriedtoreasonwithPaul,butheinsiststhathelovesBarbaraandlaughsheroff.BarbaraisequallydisdainfulofherandagreestomeetPaulfordinnerthatnightathisapartment. Norma'shusbandStephenLawryisascientistleavingthatnightonatriptotestasecretinventiononwhichhehasbeenworkingforthegovernmentandthewareffort.WorriedaboutBarbara,sheusesapretextnottoaccompanyStephenandgoestotheapartment.WhenBarbaraarrives,shefindsPaul'sdeadbodyandthinksthatNormahaskilledhim,eventhoughNormainsiststhathewasdeadwhenshearrived.BarbarathreatenstocallthepoliceunlesssheleavesStephen.Fearingthatascandalwillhurthim,Normaagrees.NormathenturnstoMac,whogoestoPaul'sapartmentwithFridayandMarty,onlytofindthebodyandtherugunderitmissing.AmanarrivestoreplacetherugandMachidesinacloset,overhearingatelephonecalltoNorma'snumberfromGabrieltoVera.Macaccidentallygiveshimselfaway,butwithFriday'shelpoverpowersGabriel,whorefusestotalk.MachasMartyhidehimtokeephimunderwraps. Normareturnstohercountryhomeunexpectedly,whichdiscouragesanespionageringthatincludesherbutler,Hansen,frombreakingintoStephen'ssafeandstealinghisplans.TheyhavekilledGerente,whowasalsoanagent,andhiddenthebody.MacarriveswithFridayatNorma'shouseandpretendstobehercurmudgeonlyUncleMacwhohascomeforavisit.HisblindnesslullsanysuspicionsHansenmighthaveabouthim.Shortlythereafter,Barbaracomeshomefromanemergencyrehearsal,calledtogetheroutofthehousebyherdirector,CheliScott,whoinveiglesaninvitationtospendthenightattheLawryhome.UnknowntoBarbaraandNorma,Cheliistheringleaderofthespies.CheliorderedPaulkilledbecausehisaffectionforBarbarawasbeginningtolimithiseffectiveness,andsheimmediatelysuspectsMacisnotwhatheseems. Gabriel'swifeVera,theLawrys'maid,isalsoapartoftheplot.WhenGabrieldoesnotreturnhome,Verabecomeshystericalwithworry.MacsecretlyasksVeratomeethiminthegreenhouse,usingherworryaboutGabrielasalure.Sheisobservedbytheothers,however,andiskilledbyHansenbeforeshecanreachMac.Thespiescutthehouse'stelephonewiressothatMacandNormacannotcallthepolice,andChelihasMaclockedupunderguard.Usinghisblindnessasadistraction,MacoverpowershisguardandreleasesFridayoutawindowwithinstructionstogohomeandgetMarty.StephenarriveshomeandChelithreatenshisfamilyifhedoesnotgiveherthefinalstepincreatinghisinvention,whichwasnotinthesafe.BarbarafinallyrealizeshowmuchNormaactuallycaresforher.Mactriestostallfortime,butislockedinthecellar.WhenHansengoestokillhim,Machasbrokenthelightbulbandhisadvantageoftotaldarknesshelpshimovercomethespy.MartyandFridayreturnwiththepolice.WhenFridayisspottedbyalookout,MacoverpowershimandissavedfrombeingshotbyanotherlookoutbyFriday.Afterthespiesarecaptured,StephenandNormaareofftoWashington,D.C.,withBarbararemainingbehindtocareforhernewUncleMac.
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