The Third Twin was at most times unputdownable. It had the right amount of suspense and mystery to keep me turning the pages. It held my attention. The characters were fairly intriguing, and the mystery of the possible third twin was enough to keep me going. 
 BUT, Revenge meets Pretty Little Liars it is not. I think there must be someone unwritten rule that if it's in the YA Thriller/Mystery Genre, you automatically have to compare it to Pretty Little Liars. Kudos to Sara Shepard, bad for all of the authors whose books have to live up to that same panting enduring, mysterious intrigue. This one does an okay job of it, but by the end I'd already guessed the ending and was not impressed. 
 The author drops the hint of what's going on far too early and it kind of tells you what's going on before you can really start guessing. Hey, I like to play Sherlock, just like the rest of them. I would've liked to play whodunit, who is it, for a little longer. 
 In some strange way it didn't make me not enjoy the book, I just had that whole, "I already know what's going on," feeling. That feeling is great when you felt like you've solved a great murder but not when you're reading like a three hundred page book, and you're only on page fifty. 
 The characters themselves were interesting, not moving, but interesting. It gave me the whole, "The Lying Game" feel, which was fun, but already done. 
 I know it sounds like I didn't like the book but I did. I enjoyed it, but I'm not crazy about it one way or the other. 
 There's romance but it's tame. Although by the end, that part of it, I was happy with. I could go on and on about what's good and what's bad but it is what it is--an interesting story, with an intriguing mystery, and a so-so conclusion. 
 I'd love to read a YA mystery that can hold a card to something Gillian Flynn could write, that would move me.