The Book Thief is the best book in this series, although it can most definitely be read as a stand alone. The Book Thief brings us story to tell everyone.
It was hard to get past how the girls were treated in this book. Disrespected, slut-shamed. If you can manage to overcome that, good luck trying to get past the cheese-fest that was this book The Book Thief. I tried. I really did. I'll give it another year or two (since that's how long it's been since I've read a book by this author).