Steampunk adventure with an environmental point.
After a daring chase across the globe, Tim Barnabas and Clara Calland have brought Clara's scientist father's secret formula to Westralia. Here, much of Australia is simply too hot to be habitable by day. Duke Malcolm, of the Imperial Security Service, transports Claras rebel-father to a prison in Eastern Australia, hoping to bait her into attempting a rescue. Clara looks to Tim for help, only to find he has fled a racist incident into the desert. She takes a burrowing machine know as a "steam mole" in search of him. The two head to Eastern Australia, where they discover an invading force with plans to take Westralia.