Once in a while you'll come across a book that really keeps you reading. Not your average page turner, but something that really excites you & keeps you reading. This is one of those books. 
 Where to start? First off, I love how realistic the characters are. Emily doesn't have some unrealistic quirk to her & while she's definitely not one of the "beautiful people" she's not the specific target of anyone's ridicule. (Her friend Megan did have that dubious honor at one point in her past, though.) She could literally be one of any thousands of average teenage girls out there. That's what makes her nocturnal changes into the wild child Emily all that more potent. Another thing worth crowing about is that there's no romance in this book. Sure, Emily has hormones but those take a back seat to her fright over how she's been acting & how it's been impacting her daytime life. Again, another touch of realism. (There will probably be romance in the next book, though.) 
 The only thing about it I could say kept me from enjoying it as much as I'd like is that when we DO discover what's going on with Emily, it kind of comes a little out of left field. Sampson does a good job of trying to blend it into the story but when the discovery is revealed it's kind of "huh... that's a surprise- doesn't entirely make sense, but I'll run with it". It's not anything that will ruin the book for you but it might make you step out of the story for a minute. 
 Overall this really was well worth reading & I can tell that this series is going to be pretty popular, up there with greats such as Soul Screamers & Wicked Lovely. 
 (ARC provided by Amazon Vine)