Fever Crumb is a girl who has been adopted and raised by Dr. Crumb, a member of the order of Engineers, where she serves as apprentice. In a time and place where women are not seen as reasonable creatures, Fever is an anomaly, the only female to serve in the order. Soon though, she must say goodbye to Dr. Crumb - nearly the only person she's ever known - to assist archeologist Kit Solent on a top-secret project. As her work begins, Fever is plagued by memories that are not her own and Kit seems to have a particular interest in finding out what they are. Fever has also been singled out by city-dwellers who declare her part Scriven. The Scriveners, not human, ruled the city some years ago but were hunted down and killed in a victorious uprising by the people. If there are any remaining Scriven, they are to be eliminated. All Fever knows is what she's been told: that she is an orphan. Is Fever a Scriven? Whose memories does she hold? Is the mystery of Fever, adopted daughter of Dr. Crumb, the key to the secret that lies at the heart of London? Haunting, arresting, and astonishingly original, Fever Crumb will delight and surprise readers at every fast-paced, breathless turn.

The birds are teaching Arlo to fly…In a faraway corner of a ruined world, a mysterious boy is building a flying machine, aided in his research by birds who can talk. Then, into the extraordinary crater city of Mayda, where buildings ascend the cliffs on funicular rails, comes a refugee: a beautiful, brilliant, half-human engineer called Fever Crumb. Fever is just the engineer that Arlo needs to get his invention off the ground. But ruthless enemies stalk them, who will kill to possess their secrets – either to steal their revolutionary machine, or to destroy the secrets of flight forever. In this breathtaking story from the awesome world of Mortal Engines, Philip Reeve creates an extraordinary new landscape of moving buildings, outlandish creatures, sinister villains and groundbreaking scientific discoveries.

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.