"Worldshaker" is a steampunk novel written by Richard Harland. It follows the story of a young boy named Colin who lives on a massive mobile city called the Worldshaker. This city is powered by steam and is home to the elite, while the lower classes, known as the Unclean, are forced to work in harsh conditions. As Colin discovers the truth about the Unclean and their struggles, he begins to question the society he has always known. The novel explores themes of class struggle, morality, and the quest for freedom, making it a compelling read for young adults and fans of the genre.