This story places the crawlers on the 8th floor of the dungeon and the maddening AI has designed the floor to force the crawlers to face off against each other to cull the numbers down for the Faction Wars on Level 9. Of course, there is also interaction among Carl / Donut and the other Faction Wars participants. We also get more backstory about Carl, Mordecai, and even Odette. It is hard to believe that six books in this story could continue to be as entertaining as book 1, but I think it just gets more intriguing and more emotionally vested for every one of the crawlers. Highly recommended!