MysterywriterJanetFrobisherlivesaloneinadarkEnglishcountryhouse,whenshe'snotphilanderingwithhersecretary'sfiancéeAtanextremelyawkwardmoment,shehasanunwelcomevisitorGeorgeBates,whoclaimstobethepartnerincrimeofJanet'sestrangedhusbandGeorgeinsinuateshimselfintoJanet'shomeandlifedespitehereffortstogetridofhim;thetangledrelationshipsdevelopintoamacabre,murderouscatandmousegame