I wanted to love this book, I really did. I read the previous installments about a year ago, they got me hooked, and I was eager for this one to come out. What a major disappointment! And I was left with more questions than answers upon reading it. 
 The main problem I had with this book is that it didn't seem believable to me. Every so often I was asking WTF? and had to supress constant eye rolling. It looked like the author was inventing things on the spot, without thinking them through, without any forshadowing in the previous books. The devilcraft felt just too much like deus ex machina, it was all over the place.You don't know how to explain something? No problem, blend some devilcraft in, and you won't have to, readers will just have to swallow up all the weirdness without protest. That is kind of lame. And anyway, (view spoiler)[if Dante swallowed all the prototypes and turned himself into a devilcraft factory, how was he going to produce more of it? Pee and use it to his needs? (hide spoiler)] 
 I gave the book two stars only because Patch and Nora got their Happily Ever After.