This was the perfect conclusion to the trilogy! Everything was wrapped up swimmingly! I admit, I'm a bit curious as to the Zoological society. I wouldn't mind a story about their adventures in that field! 
 But, this book was brilliant. The characters evolved realistically through the entire series. I could easily believe their personalities, secrets, and idiosyncrasies. I thought Westerfeld handled all of the characters- both main and side ones- masterfully. 
 I adored Bovril and his other friend. Those perspicacious lorises are certainly something to behold. 
 (view spoiler)[It was all quite exciting. Though, I was a bit disappointed to find out that the Goliath was a fraud. It made some of the events earlier in the book useless and pointless. Alek really did kill a man for almost nothing at all. Not quite, of course, because he saved the Leviathan, but still, it wasn't as dire a situation as we'd been led to believe. (hide spoiler)] 
 That was the only thing that annoyed me, really. I enjoyed this book immensely and couldn't put it down.