Tempers are flaring around Zombillenium, the amusement park run by monsters. When one hires only the witches, vampires, werewolves, and other undead in a region where unemployment is in the double digits, one must expect some friction. But things get particularly ugly when the park's security is breached from two sides: activists and a very strange visitor, the mother of two peculiar sons that the head of the park seems to remember from somewhere...