Ghost Town (Morganville Vampires, Book 9)

While developing a new system to maintain the town's defenses, genius student Claire Danvers discovers a way to use the vampires' powers to keep outsiders from spreading news of Morganville's "unique" situation.

But when people in town start forgetting who they are-including the vampires-Claire has to figure out how to pull the plug on her experiment before she forgets how to save herself...and Morganville.