WhenWilliamGridleyarrivesfromtheUSinLondon,herentspartofCarlyHardwicke'shousefromherandpromptlybeginstofallinlove.Gridleydoesn'tknowthatmanypeoplethinkshekilledherhusbandbuthisboss,theAmericanambassador,knowsanddoesn'ttakethislapseofjudgementlightly.SinceCarlyisalsoAmerican,Gridleysaveshisjobbyintroducinghertotheambassador,whoispromptlysmittenandpromisestohelpher.SowhenaScotlandYarddetectivearrives,wantingtogettothetruthonewayoranother,theysaythey'llhelphim.Andthenthecomediccomplicationsreallybegin.
