Scott Westerfeld really knows how to build a world. It's been a year and a half since I read Leviathan, but I didn't have any trouble slipping into his world once more. The characters were just as believable and likable as before.
This book did exactly what a second book in a series should do. It carried on the story seamlessly, gave me plenty of action and questions to solidify my interest, continued to build tension and set me up for the next book.
Now I can't wait for the last book to come out. How will Alec learn that Deryn is a girl? And will he really run a mile? That's my burning question!