Philip Reeve's 'Mortal Engines' plunges readers into a stunning post-apocalyptic world where colossal, traction-powered cities roam the desolate Earth, devouring smaller towns for resources in a concept known as Municipal Darwinism. The story follows Tom Natsworthy, a low-ranking apprentice from London, whose life takes an unexpected turn after a fateful encounter with Hester Shaw, a mysterious and scarred assassin. Together, they navigate the treacherous wastelands, uncovering ancient secrets and confronting powerful forces that threaten the very existence of their mobile civilizations. Reeve masterfully crafts a unique and imaginative universe, filled with thrilling action, memorable characters, and profound reflections on humanity's drive for power and consumption.