Fever Crumb (Mortal Engines Prequel 1)

Fever Crumb is set many generations before the events of Mortal Engines, in whose brilliantly-imagined world massive, predatory Traction Cities chase and devour each other.
Now London is a static, overcrowded, riot-torn powerhouse that hides an explosive secret. Is Fever, adopted daughter of Dr Crumb, the strange key that will unlock its dangerous mysteries?