Unfaithfully Yours follows composer Claude Eastman (Dudley Moore) on the basis of the 1948 Preston Sturges movie as he becomes confident that his youthful wife (Nastassja Kinski's Daniella) is having an affair with a hunky singer (Armand Assante's Max) - with the story finally detailing Claude's attempts to plot a complex vengeance.It's a good premise that director Howard Zieff uses to watch (if mostly forgettable) impact, as the filmmaker, working from a script by Valerie Curtin, Barry Levinson, and Robert Klane, provides a slow-moving comedy that eventually benefits significantly from the above-average attempts of its multiple actors - with Moore's typically winning turn matching his two costars.There is also little doubt that the opening hour of Unfaithfully Yours contains a number of admittedly hilarious pieces of comedy that contribute heavily to the affable atmosphere, although it should be noted that the excessively slapsticky third act is not quite capable of making the knee-slapping impact that Zieff certainly intended.- Which confirms the location of the picture as a rather small Moore car.