Scrivener's Moon — Philip Reeve

FEVER CRUMB returns to London . . . but the city that she'd known is gone. This new London, created by her own parents, squats motionless and vast, tiers of steel resting on enormous caterpillar treads, nearly ready for travel.

Fever has never felt truly at ease in the city of her birth, and now it feels more foreign than ever. So she sets out on a treacherous journey to the wastelands of the north, searching for a mysterious black pyramid that might hold the secret to Ancient technology, to Stalker brains, to the Scriven race -- and to Fever herself.

Her journey brings her into the midst of a north-country nomad tribe. There she befriends a warrior girl named Cluny whose prophetic visions have made her the leader of a movement that is gathering to rise against the new, mobile London.

In the wild northland, Fever feels, perhaps for the first time, truly at home. Yet as the nomads' landships rumble toward London, Fever is thrust into the heart of a great war -- and will have to decide which side she's really on.

This is the brilliant, exciting, and heart-wrenching third novel in the Fever Crumb trilogy. Philip Reeve has created a fascinating world that readers will want to return to again and again.