Adapting what may be the most popular of graphic novels, by the edgy Hard Case Crime author, adding layers and exploring the nature of morality.

A tragic, unnamed engineer-turned-criminal is immersed in chemicals that disfigure him bizarrely, driving him mad and thus giving birth to the Joker. While the insane criminal is imprisoned, Batman and Batgirl (Barbara Gordon) patrol Gotham City together, taking down perps such as the crime boss Maxie Zeus. Simultaneously Detective Harvey Bullock works with Commissioner James Gordon to take down a drug factory. Back in Arkham Asylum, Joker learns of a new technology he wants to acquire and escapes, setting out on a mission designed to break the Commissioner, forcing him to abandon his ideals as a police officer. In a violent home invasion he shoots and cripples Barbara, then takes Gordon hostage. Batman races to rescue Gordon, ultimately confronting his arch-foe in an amusement park fun house.