In between running her vampire nightclub and hunting down the perfect pair of shoes, Betsy learns her long-lost half sister Laura is actually the spawn of Satan. Complicating matters, prophesy states that the devil's offspring and the queen of the vampires are destined to rule the world together. Tracking Laura down, Betsy finds a mild-mannered and warmhearted college student--whose father happens to be a minister. Breaking the news of world domination to her newly discovered sibling might be a bit more difficult than Betsy imagined.