I found What Happens in France to be an OK novel. I liked the premise of a woman using her status as a game show contestant as a platform to try and find her long, lost, runaway sister to be an interesting idea. The novel tended to be a tad slow and repetitious. I am, honestly, not a fan of the same details being written about over and over. I can see how this tendency would be used to drive home the desire of Bryony to contact her sister.
The real depth of the story comes from the budding relationship between Bryony and Lewis, her show partner. He carries pain from a recent breakup that tempers Bryony’s thoughts about their chances. When the ex intrudes, it all blows up for them and she is certain all is lost.