Some many great things happen in this book but the final “big” fight, the return of believe in a crawler and the absolutely amazing ending will give you an adrenaline rush which will make you start Book 5. Even the epilogue is 5 stars. Matt has done such a great job at dropping hints here and there that you as the reader/listener can be both very surprised but also can see it coming from a mile away. Look for the hints/glimmers… Goodness sake if Book 3 gives you return of the the King vibes, Book 4 is like Cid Kagenou (Shadow) saying “who’s running? Running where? And… WHY WOULD I RUN?” Carl seeded the change in Book 1 and Book 3 & 4 are starting to show signs of those ideas germinating thru the galaxy.