I have a book waiting in my bookshelf named "Les Bienveillantes". I haven't gotten to reading it(partly because my French isn't that good), but, apparently, it is claimed to be rather good. From Wikipedia:
The Kindly Ones (French: Les Bienveillantes) is a historical novel written in French by American-born author Jonathan Littell. The 900-page book became a bestseller in France and was widely discussed in newspapers, magazines, academic journals, books and seminars. It was also awarded two of the most prestigious French literary awards, the Grand Prix du roman de l'Académie française and the Prix Goncourt in 2006. As of December 2009 it has been translated into seventeen languages.
The book is narrated by protagonist Maximilien Aue, a former SS officer of French and German ancestry who helps carry out massacres during the Holocaust, but in the end flees from Germany to start a new life in northern France. Aue is present during several of the major events of World War II.