Who’s hunting those closest to Batman? Commissioner Gordon calls in the Dark Knight Detective when there’s a murder at the Gotham City Aquarium-staged to look exactly like Thomas and Martha Wayne’s crime scene, right down to the playbill and pearls.

How does this bizarre homicide tie into the shadowy monster that attacks Dr. Leslie Thompkins? This creature looks to wage a war on Batman—and it’s using Joker gas to do it! Don't miss a moment of this thrilling tale that includes Detective Comics #27, Detective Comics 994-1016, 1018-1033, Detective Comics Annual #2, Detective Comics Annual #3, Batman: Pennyworth R.I.P. #1.