The Difference Engine, written by William Gibson and Bruce Sterling, is a groundbreaking alternative history mystery book that explores a world where Charles Babbage's Analytical Engine became a reality. Set in Victorian England, the story follows Sybil Gerard, a woman caught in a web of conspiracy and murder. As she unravels the secrets hidden within the emerging technology, Sybil becomes entangled in a dangerous game that could change the course of history. The Difference Engine combines elements of steampunk, mystery, and alternative history, offering readers a unique and thought-provoking reading experience.