Allow me to be blunt-this is a really, really, good book. If you are looking for a solid fantasy story, look no further. 
 The Good Stuff 
 What wasn't good about this book? The writing is absolutely gorgeous. Schwab has an exceptional way with words, and those words take you through an incredible journey. I was pulled into the world as soon as I turned the first page. She is just an amazing writer. 
 And then there is the story itself. Woah, baby. I feel like I have said this way too many times this year, but it is unlike anything I have ever read. The dynamics of Kell's worlds are crazy! Three different Londons in three different worlds that each have something special about them. And then you add the insane magic...you have yourself an exciting story. The action and thrills are fast-paced, and start from the get-go. So you don't have to worry about waiting around in the first few chapters to get to some action. I liked that she pulls you in from the very beginning. 
 The two main characters are awesome. Kell is very different and obviously interesting, what with his crazy powers and whatnot. But Lila is easily my favorite character. That girl has spunk. She also has determination and big goals set for herself. I like that she has a plan and (most of the time) sticks to that plan to make sure she reaches her goals. Lila is a wonderful character. 
 The Not-So-Good Stuff 
 This is really hard for me, because I am reaching to find something wrong with this book. Mostly I felt like the ending was kind of quick and resolved everything too easily. It doesn't end with a cliff-hanger, so I'm guessing this was originally meant to be a stand-alone. Or maybe not? Maybe that was what Schwab was going for? I'm not sure, but knowing that there is a second book, it didn't leave me much to wonder about for the next portion of the story. 
 I also felt like I didn't get to know Holland enough. I can't say much about his overall character because that would give a lot of stuff away, but I wish we had the chance to learn more about the true nature of the character. 
 Other than that though, this book is exceptional. It's a solid story and gives you lots of adventure to entertain yourself. Love this book.