Goliath is the third book in the Leviathan trilogy, featuring a alternate WWI, where the Germans have steampunky mechanical devices and the British are "Darwinists"—doing advanced genetic engineer. The titular Leviathan of the first book, for example, is a living airship* that's a heavily modified whale. There's also a prince on the run, a girl disguised as a boy, equally hidden love, and perspicacious loruses. Oh, and Tesla. Who is a jerk.
Great stuff and a fine end to the trilogy.
FuzzyCo grade: A-
* You have to have airships for steampunk.