Batman: Fear Itself Paperback by Michael Reaves and Steven-Elliot Altman

Unbeknownst to the general public, a powerful new designer drug has hit the streets of Gotham, courtesy of an evil genius determined to turn the expression “scared to death” into lethal reality. Unlike the Caped Crusader, who petrifies only villains, this mastermind is targeting decent citizens—and he’ s come up with the ultimate delivery system. After all, the public can’t refuse something they can’t see, hear, or smell. That’s the beauty of a terror toxin that is undetectable by the human senses. And with all of Gotham’s super-villains incarcerated, Batman must hunt down a mystery madman about whom he knows nothing.