I always appreciate books that can be informative to both middle school and high school readers, and this is a great choice for stronger middle school readers. It's a bit longer, and there is a lot of information. The French Resistance is one of the World War II topics that I find particularly interesting.
There is still a need for lots of books about WWII, and resisting the Nazis is a favorite topic of mine, since it involves a lot of suspense even if there are not as many battles, which makes it a popular choice for a wider variety of my readers. If you enjoyed this author's Heart of a Samurai or Shadow on the Mountain, or WWII books such as McDonough's The Bicycle Spy, Calkhoven's Michael at the Invasion of France, Giff's Genevieve's War, or Gratz's Allies, this is another great choice.