A series of explosions rocks Gotham. Batman finds himself in the middle of a turf war between rival crime bosses Rupert Thorne and the Penguin. Meanwhile, Commissioner Gordon and his daughter Barbara look for ways to fix Gotham's corrupt Criminal Justice System from the inside.

After her multi-millionaire father goes to prison, leaving her strapped for cash, thrill-seeking dilettante Selina Kyle turns to a life of crime as the daring Catwoman, evading the law at every turn. Batman hatches a plan to end her crime spree while two renegade police detectives intend to see that she uses up all her nine lives in one fell swoop.

When Mayor Jessop assembles a task force to catch Batman, Detective Montoya is put in charge. Detectives Flass and Bullock take matters into their own hands in an attempt to trap Batman, putting Gotham in a fiery jeopardy.

Someone is kidnapping and brain-washing rich, powerful men in Gotham, and Batman must find out who and why. When Barbara Gordon begins to suspect that one of her friends may be involved in the abductions, her investigation puts her on a collision course with the Dark Knight.

In the aftermath of a botched assassination attempt on Commissioner Gordon's life, Montoya vows to do everything in her power to protect Gordon. Batman's investigation into who was behind the hit leads him down a rabbit hole with only one clear answer: trust no one.

Barbara Gordon and Batman's attempt to keep Harvey Dent safe until he testifies in court leads to an all-out war between Gotham's heroes and villains.