Watchmen, written by Alan Moore and illustrated by Dave Gibbons, is a groundbreaking alternate history graphic novel set in a world where superheroes exist. The story takes place in an alternate 1985, where the United States is on the brink of nuclear war with the Soviet Union. As a group of retired superheroes investigates the murder of one of their own, they uncover a conspiracy that threatens to change the course of history. Watchmen is known for its complex characters, intricate plot, and exploration of moral ambiguity. It is widely regarded as one of the greatest graphic novels of all time.