: It is perhaps the most ambitious modern example of steampunk, blending Victorian-era social structures with futuristic, rusted technology.

In 2018, the world was brought to the big screen, produced and co-written by (of Lord of the Rings fame) and directed by Christian Rivers.

The central hook of the series is . In this world, ecosystems have been replaced by a mechanical hierarchy. Large "Traction Cities" like London roam the Great Hunting Ground, chasing down and dismantling smaller "prey" suburbs to scavenge fuel, metal, and slaves.