Traction City (World Book Day 2011)

In a post-apocalyptic future where massive traction-powered cities attack and consume smaller ones, London roams the wasteland as a predatory metropolis. A rebellious young aviatrix and a secretive scavenger boy discover a murderous creature hidden within London's vast superstructure that severs the right hands of its victims. They must confront a rogue robotic Stalker that has become dangerously out of control in this World Book Day 2011 release set in Philip Reeve's Mortal Engines universe.