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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,
r to destroy the secrets of flight forever.

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Two years ago, Fever Crumb escaped the war-torn city of London in a travelling theatre. Now she arrives in the extraordinary crater city of Mayda, where buildings ascend the cliffs on funicular rails, and a mysterious recluse is building a machine that can fly. Fever is the engineer he needs - but ruthless enemies will kill to possess their secrets.

The fabulous sixth book in the Mortal Engines series, from the brilliant
and award-winning Philip Reeve.

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