They've already made this book into a movie. I saw the preview and it looked good so I purchased the ebook from Amazon with a birthday Kindle giftcard (Thanks, Bass!)
It's one of those bi-chapter perspective shifters. You go from present day American journalist in Paris writing an article on the Vel d'hiv (round up of the French Jewish population in Paris in July of 1942 by their own police) to a 10 year old French-born Jewish girl who is living through it.
Obviously it's depressing but the mystery, intrigue and historical relevance has kept me hanging on.