This review has spoilers
Honestly the worst in the series by far. Previous additions where funny with suspenseful moments and introduces new character, this part of the series throws it in the trash and decided anime songs are the words to summon demons for five minutes straight. He destroys Fizzy as a character to make her bland boring, a literal robot. That author also though that explaining everything that happen several times over is a good thing, the last 30 minutes of the audio book is just explaining what happened during the middle and end. Honestly the books length could be brought down by about 3 hours if you took away all the rehashing.
My honest opinion is to avoid this book and stick with the end of book two, Boxy is taken to the capital and is killed. Fizzy becomes a slave to made weapons of war for the rest of her life in the human capital.