No. Just no. 
 I don't know where Maggie Stiefvater left her brain while writing this book: plot, writing, characters, everything is so bad I really struggled to recognize the same author of The Raven Cycle. 
 I said at the end of Shiver that a sequel wasn't really necessary. Stiefvater must have thought the same thing, since she decided to add two brand new, boring, useless, irritating POV. Cole and Isabel a so cliche that it really superfluous talk about them. Since James Dean made the concept of rebel-without-a-cause so appealing so many years ago, we could never get rid of tormented youths that have no real reason to be tormented in books and films. Oh, but it is so cool to be tormented! 
 There are so many holes in this plot, I could write a book just listing that but what is unacceptable is the dumb plot twist (announced in the prologue) that makes Grace transform into a wolf, after years of not changing, right after her beloved is human for good. Because let's say it: Cole's improvised scientific epiphany in the cafeteria is just crap. 
 Not to mention the U-turn made by Grace's parents: in the first book they completely ignored her, now the conveniently turn into the Bad Witch, to the point of forbidding her to see him and making fun of their ETERNAL LOVE. This representation is so silly, and immature that it seems taken from the diary of a teenager. 
 Nothing of this book make sense and characters keep being mentioned and then forgotten throughout the story. 
 Horrible.