Tom and Hester's daughter, Wren, longs to escape the peace of static Anchorage. She craves the dangerous adventures her parents once had - and a charming submarine pirate is ready to take her to sea. But the mysterious object that she steals for him ignites conflict that will tear the whole world apart.. The third thrilling instalment of Reeve's critically acclaimed MORTAL ENGINES quartet is repackaged with a fantastic and eye-catching cover featuring new artwork.