The Fever Crumb trilogy…

Set many generations before the events of Mortal Engines, in whose dazzling world huge, predatory cities chase and devour each other. Now, London is a riot-torn, ruinous town, clinging to a devastated landscape and hiding an explosive secret. Is Fever, adopted daughter of Dr Crumb, the strange key that will unlock its dangerous mysteries?

… set many generations before the events of Mortal Engines …

Fever goes on to have more adventures of her own in my next book, A Web of Air, published in 2010, and subsequently in Scrivener's Moon, further expanding the Mortal Engines world…

A Web of Air…
In a faraway corner of a ruined world, a mysterious boy is building a flying machine. Birds help him, and so does a beautiful, brilliant, half-human engineer called Fever Crumb. But powerful enemies stalk them - either to possess their revolutionary invention, or to destroy the secrets of flight forever.

Scrivener's Moon…
In a future land once known as Britain, nomad tribes are preparing to fight a terrifying enemy – the first ever mobile city. Before London can launch itself, young engineer Fever Crumb must journey to the wastelands of the North. She seeks the ancient birthplace of the Scriven mutants. In the chaotic weeks before battle begins, Fever finds a mysterious black pyramid. The extraordinary secrets it contains will change her world forever. The seventh awe-inspiring adventure in the World of Mortal Engines.