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.
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.
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.