Catherine Fisher, you wrote an amazing book. Thank you so much. 
 Why was this book so amazing? 
 The plot was engaging, exciting, and interesting. 
 The setting was super neat. The prison was especially fascinating. And the world outside. It's a weakness of mine, but I really adore books about monarchy intrigues, backstabbing, and kingdomness. Makes me feel all happy and bubbly inside. 
 Also, the characters. Fleshed out, not (too) stereotypical, and even lovable! (some of them. Maybe not Gildas. Definitely not.) 
 Have I mentioned the prison yet? Incarceron? It's awesome! I mean, I get that it could never work and the science/magic behind it is never explained, but I don't really care. I loved it. As in A Face Like Glass the world and setting itself is a character, and I like what that adds to the story. 
 Really, the only thing I was disappointed with was how confused the ending left me. It felt rushed and a bit under-written. It was also quite predictable, but that isn't such a horrible thing. It was still interesting to see how things would turn out, and some of the twists were surprising. Like, (view spoiler)[The fact that Incarceron was tiny. (hide spoiler)]