The Difference Engine by William Gibson and Bruce Sterling is a groundbreaking alternative history mystery that envisions a world where Charles Babbage's Analytical Engine was successfully built in the 19th century, leading to a technological revolution. In this steampunk-infused tale, the authors explore a murder mystery that unravels a conspiracy involving powerful factions vying for control over the new technology. With its intricate world-building and compelling characters, this book is a must-read for fans of both alternative history and mystery genres.