Undead And Unappreciated

Description for UNDEAD AND UNAPPRECIATED by MaryJanice Davidson:

At least Betsy Taylor's priorities are clear. While most women would love to live as royalty, Betsy has found that being vampire queen has more problems than perks, except for always being awake for Midnight Madness sales. And the employees at her nightclub Scratch have been giving her nothing but grief sine she killed their former boss. Some people...

But Betsy's "life" takes an interesting turn at a shower for her wicked stepmother, who lets it slip that Betsy has a long-lost half-sister. Now twenty years old, this woman just so happens to be the devil's daughter -- and destined to rule the world...

This is #5 in Betsy The Vampire Queen series.