Watchmen is a groundbreaking graphic novel by Alan Moore and Dave Gibbons. Set in an alternate version of the United States where superheroes exist, the story follows a group of retired vigilantes as they investigate a conspiracy that threatens to unravel their world. Watchmen is known for its complex characters, intricate plot, and thought-provoking exploration of themes such as power, morality, and the nature of heroism. It is widely considered one of the greatest comic books of all time.