Behemoth

At the end of book one, heroes Alek and Deryn were on the air ship Leviathan, heading towards Constantinopleto deliver a secret package. Of course, there's much more to remember. Alek is the would-be heir to the Austrian throne, only World War I has thrown him in hiding from everyone, including Deryn. Deryn is hiding a secret of her own. She's a girl passing as a guy in the British air service. As their assignment heats up, so does the growing tension in their friendship. . . or is it romance. . . ? A secret mission lands Deryn in some serious danger. . . . and leads both of them to reevaluate their precarious situations in the world.