First of all, if nothing else, isn't that cover awesome? I know you're not supposed to judge a book by its cover but . . . I do admire them. :]
Overall, I enjoyed this book. I did have a couple of problems with it, but I'll get to them later.
The plot? There isn't one, really. It's really a character driven book, but there is some mystery, and some magic. I loved the reservoir and how it was its own character. I liked Ruby's character, and I was happy with her development. The ending the author gives her really fits her character, and is believable (if a little weird).
(Okay, never mind, a lot weird.)
I didn't like Chloe's character as much. My two problems with the book both involve Chloe - and sex. Seriously? Why do so many YA books feel like they need their characters to have sex to seem like real people? I think that's the reason so many authors write those scenes, anyway. Maybe they think it makes their books more attractive, more sell-able, I don't know. I just know I don't like it. Not every teen has to have sex, ya know. In fact, many don't. I might go as far to say that the majority of avid readers don't, because most of the teens I know who love to read are not that type. If the sex actually helps develop characters, and adds to the overall book, and is a necessary addition, I'm okay with it. (Bee Season does this well, though it is not YA)
I would recommend this book. I liked the ending, and the mystery of the reservoir. Not everything is explained and that is absolutely okay with this book. It just works.