Predator's Gold: Mortal Engines, Book 2

The Jenny was drifting across the shoulder of a big volcano. Beyond it there were no more mountains, just an endless blue-white plain stretching to the horizon. They were at the mercy of the wind, and it was carrying them helplessly into the Ice Wastes.
After two years of carefree traveling in the Jenny Haniver, Tom and Hester find themselves back in danger. Fleeing from the grim aviators of the Green Storm, they stumble onto the ice city of Anchorage just in time. But Anchorage is not a safe refuge: devastated by plague, and haunted by thieves — or perhaps ghosts — the city is barely lurching along. The savage Huntsmen of Arkangel are closing in, and the young margravine must make a last desperate bid for survival. She sets a course for the Dead Continent: America...

In this breathtaking sequel to the award-winning Mortal Engines, Philip Reeve plunges us into a ruthless and terrifyingly believable world where cities eat each other, betrayal is as common as the blasted land the cities traverse, and loyalty holds the only chance of survival.