Forever

One of the main plot devices in this book is the conflict with Grace's parents and, just like in the last book, it seemed so forced and unrealistic. Grace was still acting like a 17 year old child and treating her parents like trash. Also, it seemed like they kind of gave up on searching for her, even if they continued to think that Sam murdered her. No combing of lakes or the forest? No search warrants for Sam's house and property?
The second is Cole suddenly becoming a genius scientist and working out how the wolf “disease” works - and actually solving it. It seemed ridiculous and, while it's hard to argue against a fantastical disease that turns a human into a wolf seamlessly, trying to explain it like it's a realistic disease and akin it to malaria and thus making malaria a “cure”... it was just hard to not roll your eyes at. Just because your dad is a famous “rocket scientist” (do we ever learn what his dad actually does?) doesn't mean you can solve complex problems, even if troubleshooting the results on yourself without fear of death.
I still give this 4 stars because overall I really enjoyed it and thought it was a decent close to the trilogy, even if it had a lot of problems. Despite all the problems I have with Steifvater's logic and plots (see my reviews for her Raven Cycle series which I liked less than Shiver), I still really enjoy her writing and characters and will continue to read her books.