If you are familiar with this series, then you'll know the basic premise is two parallel worlds, twins in each world. I will admit that 2 books in this series are some of my favorites in the sense that I've re read them a few times each. Not because I have found them to be spectacular, but because I enjoy the stories. I'm pretty sure I will not be re reading this one. 
 If you are familiar with KA books, you'll know some were written A LONG time ago, so you get a lot of flip phone references, really bad fashion, and what has always bothered me the most, her use of slang. Oh, not to mention she loves to have the h repeat the H's name over and over during a conversation, just for the hell of it since apparently it doesn't do a single thing other than annoy. Also, the absolute over abundance of use of the word "whacked". It's everywhere people. This book starts out in the other world and I'm going to assume that for the sake of making a clear distinction that Noc is from our world, and to separate him from Tor, he basically speaks in nothing but (strange) slang. I mean, I've been around the block for a while, and I've never met someone who actually says "I know what your gig is". I mean I think there was a pretty hefty part of dialogue that had me going "what did he say?" because it was so heavy with slang it was ridiculous. This does change a little bit once they moved onto this world but not by much. 
 That being said, although this book does include iPhone and DVR references, making it more modern than the other 4, gaaahhh, her freaking slang !!! I have NEVER heard a white, 36 year old man from Seattle say "that shit is whacked". Have you ??? Because that is alllllll over her books. This story moved slower than the rest, it did have Dax Lahn's twin - Lahn being my most favorite of the H in this series, but even that part of the story felt a bit rushed and empty, thrown in just for the sake of making sure all the twins were taken care of. 
 I feel like no matter what KA book I pick up, a lot of the things I mentioned here will be there. That's actually why I stopped reading her books. I've even re read the whole Rock Chick series and by the end, I was so annoyed because at the core of them all, they're the same damn thing over and over. I will always love The Golden Dynasty and Fantastical. Hell, I had her sign them at a book signing, but yeah, this book was not the greatest. I am fairly certain I won't read any more from her either.