Mortal Engines: Thunder City - Philip Reeve

An epic, thrilling, action-packed city-eat-city adventure starring brave fighter Tamzin Pook, who must travel from the spectator sport combat arena in Margate to the Thunder City, where a chilling, ruthless villain has seized power. She will face Revenants - animal/machine hybrids with ferocious appetites - dangerous mercenaries and must learn to trust a group of oddballs whose eccentricities mask their huge hearts and steadfast courage. The Mortal Engines series has sold over half a million copies in the UK alone via Nielsen Bookscan.