Billy Wilder's most obvious homage to Ernst Lubitsch is- of course- set in Paris, though on location rather than in the Paramount studios. And there are a couple of Lubitsch associates in lead parts. Gary Cooper plays a rich American tycoon/lothario and Maurice Chevalier is a private detective specialising in divorce cases. So dedicated is Cooper to philandering, that Chevalier has a thick file of investigations involving him.
When the Frenchman's inexperienced but precocious daughter (Audrey Hepburn) falls in love with Cooper, she uses cases from her father's archives to make her lover jealous. It is a very cynical film, and even at the end we are never sure if this much older man really sees the girl as much more than a diversion.
Few characters are sympathetic, and we rely on the charm of the cast to make them palatable. There is a problem with Cooper as a romantic lead with Hepburn. The disparity in their ages unbalances the film; it makes him more exploitative than he should and so Wilder can't find an ending we can root for. But the director does a fine job, filling each scene with interesting subtext and character insights.
It is so lovely merely to see Audrey walking through Paris at night in a Givenchy dress, or even just smiling. And Maurice still vibrates with charisma at 69 years old; a living, breathing, winking Gallic shrug. It's a witty, charming very adult comedy and it's fun listening out for the echoes of Lubitsch.