A world reshaped by clockwork and magic faces a new threat from within its own intricate mechanisms. In a world where sentient automatons, known as the Prometheans, are a reality and the British Empire has achieved technological dominance through their use, a young woman named Charlotte is drawn into a conspiracy that threatens to unravel the delicate balance of power. She must navigate a society where human and machine coexist uneasily, confronting those who seek to exploit the Prometheans for their own gain and uncover the truth behind their creation.

The novel is recognized for its intricate world-building and its exploration of complex themes surrounding artificial intelligence and societal evolution. Critics have noted Bear's ability to weave together elements of steampunk, alternate history, and philosophical speculation into a compelling narrative. The story's focus on the ethical implications of creating sentient beings and the power dynamics that arise from such advancements has been a point of discussion. Readers often praise the detailed depiction of its unique technological landscape and the engaging plot that challenges conventional notions of humanity and consciousness.