My two star rating really says it best... it was ok. As other reviewers point out, the story feels really rushed in the beginning. You don't get a chance to know the characters before you are thrown into the action. And for me, that is a pretty big flaw. I need to be interested in a character before I care what happens to them.
In my opinion, this is yet another book jumping on the "Twilight" bandwagon. Angsty teenage girl moves to a new town, starts a new school, and is immediately attracted to the dark mysterious boy who stares at her in class and treats her poorly. She starts to like him and low and behold he doesn't show up to school one day, but instead appears at her bedroom window. Then it is revealed that mysterious boy is actually not a boy but a mythical creature. The only major difference here is that the girl turns out to be one too. And even though there wasn't a really obvious love triangle happening in this first book, it's pretty easy to predict that there is one developing and it will probably appear in one of the next books.
The use of "Trolls" was really weak as well. There was nothing at all interesting about them, and they basically were no different than humans except they are picky eaters, have messy hair and don't like to wear shoes. It really just felt like the author just used Trolls because vampires and werewolves have been so overused.
And finally, a large dose of deus ex machina is given to us at the end of the story. Wendy decides to escape with Rhys, and when confronted with a fence surrounding the community Rhys suddenly "remembers" a hole in the fence whereby the two can exit. That same hole they conclude, was also used by the Vittra to enter said community. Two very important details that are conveniently solved by a sudden appearance of a hole in a fence.
Anyway, the book is slightly entertaining even though the reading level seems much younger than YA. There is enough action and teenage romance that I'm sure some readers will enjoy the book more than I did.
You can see this and other reviews on my blog http://refurbish-me.blogspot.com