Why should they drink blood?
Vampires do not need sleep or water yet feed off of blood the reason is vampires don’t really have “bodies” they drink blood to sustain their “human form” if they don’t they get turned into (whatever you want)
Sorry if it’s bad
What genre?
Sounds like a thriller to me
Weakness?
Maybe Anastasia can’t refuse any deal, and I can’t think of anything for Nicoleta 