Upon exiting Falcone's office, Holiday attacks Riddler, but for some reason leaves him alive.
It is there that he manipulates her into believing that some of Batman's most dangerous foes are after her.
The Riddler (Edward Nigma) is a fictional supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman.
The character made his first appearance in Detective Comics #140 (October, 1948) and was created by Bill Finger and Dick Sprang.
He first appears when Carmine "The Roman" Falcone hires him to figure out who the Holiday Killer is.
Falcone eventually loses his patience with Riddler, however, and orders his daughter Sophia to force him to leave.
He plays a slightly larger role in the story's sequel Batman: Dark Victory, in which Batman turns to him to figure out the significance of the lost games of hangman that are left at the scenes of the Hangman killer's crimes.