Leviathan by Scott Westerfeld, bestselling author of Uglies.
Fantastic new series that takes you into an alternate history set at the beginning of WW I. The two main characters come from opposite sides of a tense world were eastern Europe runs on mechanical devices strong and firm and western Europe took Darwin's work to a whole 'nother level. Horse and Elephant have been combined to create a beat that pulls trains through the streets of London and what they do in the air will astound you.
Releasing October 6th