The plot is Noel Coward's and concerns Larita, a motor car racer from America who weds a Brit and shocks his appalled and appalling family. Jessica Biel plays Larita. Kristin Scott Thomas is her superb mother-in-law; Colin Firth plays her father-in-law; and Ben Barnes is her husband.
The story might almost be a metaphor for Coward returning from his first trip to New York in 1921, determined "to inject the staid drawing-room dramas of the London West End with the speed of Broadway" (Oxford DNB).
I grew a little tired of Coward's hedonism after I grew up, but this movie looks to be, in Coward's words, "lots of fun".