Ahhh what a wonderful book! V.E. Schwab has created a rich and diverse world (worlds?), and I couldn't get enough. I thought it would be confusing trying to keep the London's separate in my head, but it is done so well, I had no confusion. 
 The magic system is unique, and well explained (view spoiler)[ and I'm dying to see what Lila can do... I'm suspecting that she is Antari too ;) (hide spoiler)] 
 I loved both Kell and Lila equally, and I'm shipping them hard. There wasn't much (any?) romance in this book, so I'm holding out hope in the next ones to come. 
 I can't recommend this book enough. Just read it. Now!!!