Issue Gotham Knights 18
Subtitle Cavernous
+ Fat City (black and white backup story)
Date August 2001
Writer(s) Devin Grayson
+ Mick McMahon, Dave Gibbons 
Artist(s) Roger Robinson, John Floyd
+ Mick McMahon 
storyline Aquaman checked in with Batman, but Batman blew him off. Feeling lonely without Alfred or Tim, he ended his patrol early ("slow night"). He called Aquaman back and invited him over to help fix up the cave from the recent earthquake damage.
Batman and Gordon investigated a series of murders where victims were found with no remaining body fat. They lured the oozing culprit out with the fattest woman in Gotham City as bait.