Finished it and came right to review it. What to say? 
 I loved the detail and building of the worlds to let the reader get a feel of what the characters home is like. It is especially tough for this book considering that it involves three whole different worlds of the same city. Schwab really made it easy to visualize the Londons differing levels of secrecy and danger and magic. 
 Then, of course, there are the characters themselves. Lila especially. She is an orphan who has grown up on the streets by herself and has become quite ruthless doing so. She relies on no one and refuses to care for anything but her own interests and well being. Then there is Kell, who is raised by the royal family but still feels discontent. His hobby of smuggling items from one world to another lands him in trouble and he finds himself completely out of his depth. When Kell and Lila cross paths, it is up to Lila's stubborn and fearless will that helps Kell go through and accomplish what needs to be done. Their fears, worries, and emotions are all too easy to relate to due Schwab's realistic and detailed explanations of the character's personalities and responses to the situations they find themselves in. 
 A beautifully written piece of literature that leaves me ready for the next.