Based on the original graphic novel by Frank Miller, Sin City is a dark and gritty crime-noir action movie that tells several different stories, all set at the same time in the same city. The lines of good and evil are blurred, with vigilantism being the new norm, as a city rife with corruption slowly swallows its citizens whole. Each protagonist is loosely connected to one another's stories as the movie paints a bigger picture through each new point of view.