Morganville vampires

When she pledges herself to Amelie, the most powerful vampire in town, Claire is faced with a past stalker, murder, and an ancient bloodsucker who extends a chilling invitation for private lessons in his secluded home.

While developing a new system to maintain defenses in Morganville, Texas, seventeen-year-old Claire Danvers discovers a way to amplify vampire mental powers which has an unexpected side-effect of causing residents, both human and vampire, to forget who they are.

When college student Claire Danvers learns that three of the vampires in Morganville have disappeared without a trace, only to discover that the last person seen with one of the missing vampires is a mysterious new resident named Magnus, she begins to suspect that Magnus is not a fellow-human.