Mikkel and Szandor are back! Everyone's favorite monster hunters return for a new adventure, and this time it's a monster that's bigger than they have ever dealt with before! While on a routine job in the city's underground tunnels, they stumble on a creature thought lost for years. They are then invited to join a hastily assembled team of hunters going underground to try to kill the enormous serpent. Delving deeper into the dark tunnels than they have ever gone before, Mikkel and Szandor find themselves searching for this massive beast in dark overflow tunnels and the endless labyrinth under New Avalon. But creatures beneath the city are not their only problem. Soon tensions begin running high among the assembled hunters, threatening to derail the mission and put them all in danger. Will they succeed, or will they fall prey to the gigantic monster known as Jabberwock Jack?