Detective Comics, Vol. 1 #745 (2000)

Evolution, Part 3: Law of the Land
The heads of the Columbian and Russian mobs in Gotham have been murdered by their rivals, as arranged by Whisper A'Daire. But why? Reasoning that these deaths create a vacuum in the drug trade that Whisper's allies in the Lucky Hand Triad and Burnley Massive can fill, Batman still feels that there's a major piece missing.
Release Date: 2000