Ever since Catwoman arrived in the Gotham Underground, everything has gone wrong. Princess Tinderbox of Charneltown nixed an intertribal marriage with the Warhogs, from whom Catwoman stole a dangerous bio-toxin. After her encounter with the Joker's Daughter, the crazed teen flooded Charneltown, prompting its leader, Doctor Phosphorous to strike back. The whole situation is ripe for the beginning of a war. And having now arrived in Rock Bottom to discover that the lava pits within could lead to a fire that would destroy all of Gotham City if it became hot enough. Unfortunately, the massive cache of diamonds to be found there must go untouched by her, if she intends to bring an end to all of the chaos.