The author of the best-selling and critically beloved Mortal Engines quartet has written a stunning, stand-alone prequel. 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?