The epic conclusion to the Leviathan trilogy, Goliath is pretty fantastic. Right when Alek, lost heir to the Austria-Hungary throne, finds out that his good friend Dylan is a girl (Deryn) the ship is caught up in the scheme of the insane scientist Nikola Tesla, whose machines have already tried destroying the Leviathan twice before. Now, he's on the side of the Darwinists, guiding the Leviathan to a secret weapon on the shores of America called (surprise) Goliath.
Westerfield continues his world even more, getting more of the major continents onto his map of beasties and steam walkers. We go to Japan, America, Mexico... all of which are pretty neat. Japan is a wonderful blend of mechanical machines and Darwinist beasties, while America is divided into mechanical walkers and the Darwin animals.
Ultimately, Goliath is a fantastic book. The downside is that it's finished. Let's hope that Westerfield makes another series about World War II, eh? With Alek and Deryn and Bovril? Please? View at phoenixpubliclibrary.org