Infernal Devices (Predator Cities #3)

The third thrilling book in the stunning Mortal Engines series! Wren's parents, Tom and Hester, are happy in static Anchorage, whose rusting engines are long dead. Their daughter is desperate to escape—and a charming submarine pirate is ready to help her. But the mysterious object that she steals for him ignites a conflict that will tear the whole world apart . . .