MajorPalgrave,anidiosyncraticbutcharmingmysterywriter,revealstoMissMarplethatoneoftheguestsataluxuriousCaribbeanresortthey'restayingatisaBluebeard-typewifemurderer.Unfortunately,theMajorsuccumbstoanapparentlyaccidentaloverdoseofalcoholandbloodpressuremedicationbeforerevealingthekiller'sidentity.Whenit'sdiscoveredthatthemedicinebelongedtoanotherguestandtherevealingphotographtheMajorwascarryingismissing,MissMarplerealizesthattheserialkillerhasstruckagainandmoremurderswillfollow.