Black Dawn - Rachel Caine - Paperback

The Morganville Vampires, book 12 of 15, completed series

When a tide of ferocious draug, the vampires deadliest enemy, floods Morganville, its eclectic mix of residents must fight to save their town from devastation.

Chaos has taken over the quiet college town of Morganville as the threat of the draug rapidly spreads with the help of the city's water system. Whilst most of the locals have already fled, student Claire Danvers and her friends, Shane, Eve and Michael choose to stay and fight. 

Things take a turn for the worse when vampire Amelie, the town's founder, is infected by the master draug's bite. Unless Claire and her friends can find an antidote to save Amelie and overcome the draug, Morganville's future looks bleak.