With the help of The Riddler, Detective Barbara Gordon faces off against corrupt cop Arnold Flass and his cronies on their rogue mission to find Batman.
Faced with a puzzle she can't solve, Detective Barbara Gordon begrudgingly visits the one man in Gotham City who can help her - Arkham Asylum inmate Edward Nygma, a.k.a. The Riddler.
When a key figure is found murdered, the killer's identity can only be uncovered with the help of the least trustworthy citizens of Gotham - the inmates of Arkham Asylum.