Foi Leviatã de Scott Westerfeld?
Da introdução ao artigo sobre o romance em Wikipedia :
Leviathan is a 2009 dystopian novel written by Scott Westerfeld and illustrated by Keith Thompson. First of a trilogy set in alternative version of World War I, it has Central Powers (known in-universe as "Clankers") using mechanized war machines opposed by Entente Powers (as "Darwinists") who fabricate living creatures genetically. The central protagonists are Aleksander, son of Archduke Franz Ferdinand; and Deryn, a Scottish girl with dreams of joining the British Air Service with her brother.