HollywoodstarMarinaGreggleavesLosAngelesforthepicturesquecountrysideofStMaryMead.HavingtakenupresidenceatGossingtonHallwithherdashingyoungEnglishhusband,filmdirectorJasonRudd,hissecretary,EllaBluntandMarina'sexclusivepersonalassistant,HaileyPreston,it'snotlongbeforeshebecomesladyofthemanor.WhentheglamorouscoupledecidetothrowabenefitfortheStJohnAmbulance,thegroundsareabuzzwithcuriouslocalsincludingpreviousownerofGossingtonHall,DollyBantry.Butwhenalocalfan,HeatherBadcockconsumesapoisoneddaiquiri,Marinafindsherselfstarringinareal-lifemystery-supportedbyMissMarpleandInspectorHewitt,whosuspectthatthelethalcocktailwasintendedforsomeoneelse.Butwho?IfitwasmeantforMarina,thenwhy?