When one of his former colleagues is murdered, the outlawed, but no less determined, masked vigilante Rorschach sets out to uncover a plot to kill and discredit all past and present superheroes. As he reconnects with his former crime-fighting legion--a disbanded group of retired superheroes, only one of whom has true powers--Rorschach glimpses a wide-ranging and disturbing conspiracy with links to their shared past and catastrophic consequences for the future. Their mission is to watch over humanity--but who is watching the Watchmen?