Last Breath by Rachel Caine

The adventure continues . . . There is a question Claire has long been asking: why do vampires live so far out in a sunny desert when they’re sensitive to sunlight? The reason doesn’t have to do with sunlight but water – and an ancient enemy who has finally found a way to invade the vampires’ landlocked community. Vampires aren’t the top predator on earth. There’s something worse that preys on them, something much worse. Which means if Claire, and Morganville, want to live, they will have to fight on to the last breath.