Now this, this is Mortal Engines true successor. It is set a few decades later with Tom and Hester now settled down. It starts off slower than the other two books but ultimately leads to an epic adventure that spans to quite a few locales with more interesting character's than the ones found in Mortal Engines. It adds quite a lot of new thing to the Mortal Engines world and they help to even further make you feel like your in a truly living world.
The story is brilliantly weaved together with your favourite chapter splittingness technique which finally brings all the tales together into one massive OMG plot at the end. =)