I'm a bit of a WWII history geek...mostly non-fiction, but some fiction as well. In the latter category, I found Kristen Hannah's book "The Nightingale" to be pretty special. It's focused on the French resistance during the Nazi occupation of France that began in 1940. Not everyone's cup of tea, but I liked it better than two other recent WWII books that moved a lot of needles, "Beneath A Scarlet Sky" and "All The Light We Cannot See".