This book reminds me largely of a book from earlier this year--Clarity by Kim Harrington--and the denouement in this book is fairly similar. Although this book is for a slightly older audience, fans of one will enjoy the other.
I was never personally convinced of the "sliding", and I could see the ending coming from a good ways off. But I think younger teens in particular will respond well to this book. Overall, though, I think this book will find an eager audience, even if it's not my cup of tea.
Hadley starts off as a typical teen, self-absorbed and unable (or maybe just unwilling) to see her parents as anything other than their relationship to her, but by the end of the novel (which takes place in just 24 hours) she's able to see them as adults who have lives and interests and priorities beyond being her Mom and Dad. And she realizes that while she may not have a say in their life choices (much less like them), she *can* choose how to react to their decisions, and that maybe forgiveness is a good place to start, both with herself and her new family.
So no, this isn't an exciting do-or-die adventure, nor is it a romance for the ages, or full of angsty vampires. It's simply a good story, well-told, replete with first love and second chances. Teens who like Maureen Johnson's novels or who are looking for realistic fiction that's not Gossip Girls/The Clique will enjoy this book a good bit and I wouldn't be surprised if there were a movie in the works soon.
NB: I read both of these books in ARC form, courtesy of our publishers' sales reps. The former releases from Harper in 4/12 and the latter releases from Hachette in 2/12.