简介：In1889,youngEnglishwomanVickyBarton(JeanSimmons)andherbrotherJohnny(DavidTomlinson)arriveinParistoseetheExpositionUniverselle.ThisisVicky'sfirsttimeinParis,andaftercheckingintoahotel,shedragshertiredbrothertodinnerandthefamousMoulinRouge.Shefinallyretiresforthenight,whileJohnnyhasalate-nightdrink.WhenEnglishpainterGeorgeHathaway(DirkBogarde)dropsoffhisgirlfriend,RhodaO'Donovan(HonorBlackman),andhermother(BettyWarren)atthehotel,heasksJohnnyforchangefora100francnotetopayacarriagedriver;Johnnyloanshim50francsandgiveshimhisnameandroomnumber. Thenextmorning,VickyfindsablankwallwhereJohnny'sroomusedtobe.WhenshequestionshotelownerandmanagerMadameHervé(CathleenNesbitt),thelatterclaimsshearrivedalone.Theroomnumbernowadornsthecommonbathroom.MadameHervé'sbrotherNarcisse(MarcelPontin)andthedayporter(EugeneDeckers)backupherstory. Frantic,VickygoestoseetheBritishconsul(FelixAylmer),followedsecretlybyNarcisse.Shehasnoproofofherbrother'sexistence,sotheconsulcanonlysuggestshefindawitness,Nina(ZenaMarshall),thehotelmaidwhoattendedher.NinahadinformedherthatshewasgoingupinaballoonwithherboyfriendattheExpositionthatday,sotheconsultakesherthere.Tragically,sheistoolate.BeforeshecantalktoNina,theballoonascends,burstsintoflames,andplummetstotheground,killingthetwopassengers. VickytriestheFrenchpolicecommissaire(AustinTrevor).HequestionsMadameHervéandherbrother,butcanfindnothingamissintheirstory.Sinceherroomhasbeenreservedforonlytwonights,Vickyhastoleavethehotel.MadameHervéoffersheratickethometoEngland,whichsheisforcedtoaccept,asshehaslittlemoneyleft.However,unbeknownsttoeitherparty,RhodaO'DonovanhasbeenaskedbyGeorgeHathawaytodeliveralettercontaininghisloanrepaymenttoJohnny.Notfindinghisroom,RhodaslipstheenvelopeunderVicky'sdoor,whereshefindsit. VickygoestoseeGeorge.Whenheconfirmshavingmetherbrother,sheburstsintotears.Heoffershisassistance.Georgenoticestherearesixbalconies,butonlyfiveroomsonthefloor,andfindsthemissinghotelroom,theentrancehavingbeencoveredovertobepartofthewall. Underquestioningbythepolice,MadameHervérevealswhereJohnnyhasbeentaken.ItturnsoutthathebecamesickwiththeBlackPlagueduringthenight.ThenewswouldhavebeendisastrousfortheExposition,sohewassecretlytakenawaytoahospital.GeorgebringsalongDoctorHart(AndréMorell),whotellsVickyherbrotherhasachanceofliving.…