Salmander and Johanne sneak into Hellfish at night and come across something strange. They overhear Bosse Nova talking about the infamous serpent Tulla, and despite Salmander's chronic seasickness he decides to defy his fear and look into this phenomenon.

Salmander and Johanne have each on their own exposed Bosse Nova's drug business. Without police help, but armed with confidence and a machine gun, Salmander comes back to Hellfjord for a final showdown with Bosse in the fish factory Hellfish.