Infernal Devices, Paperback/Philip Reeve

In a world removed from the huge motorized cities of MORTAL ENGINES, Wren is desperate to escape the static city of Anchorage, and a charming submarine pirate is ready to help her. But when she steals a mysterious object, she ignites a conflict that could tear the world apart. The third thrilling book in the award-winning MORTAL ENGINES quartet.