Wren longs to escape from Anchorage. She craves the dangerous adventures her parents once had - and a charming submarine pirate is ready to take her to sea. But the object that she steals for him ignites a conflict that will tear the whole world apart... The third thrilling instalment of Reeve's critically acclaimed MORTAL ENGINES quartet. 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 a conflict that will tear the whole world apart...