Follows the story of two sisters living through Germany's invasion of France during WW2.
Isabelle starts off as a reckless, fairly unlikeable character who thinks she can get out of any situation with her beauty and charm. She redeems herself with her heroics and bravery, and seems to grow up, however it seems like she never really faced consequences for her initial naive and impulsive behaviour and got away with everything.
I did like the sort-of twist where you hope that it might be Isabelle who's the elderly woman in the present day and then it turns out that she passed away fairly soon after the end of the war, and that it is in fact her sister. That present day reveal in Paris was probably the best bit of the novel.