I really enjoyed the first three books in the series, but after the third book, it kind of felt finished. Since I was reading a book containing the first books all in one, I knew it had to continue one way or another, but I was still a bit disappointed in the way they made it happen. After all, they might have been acting as rebels, they are not soldiers.
The action is still very fast-paced but the story is less big than the previous books. Nevertheless, I still enjoyed the series, also in the second part.