Blood of the Elementals (Vance Silver, Vampire, Hunter)

Returning to Los Angeles after two years in New York, Vance discovers a city harrowed by vampire hunters. The hunters may be of the same organization that once trained Vance. Some vampire hunters are righteous. Others may be motivated by something less honorable. Vance has to figure out not only what kind of hunters he is dealing with but what kind of hunter organization trained him. He'll have the help of his bloodmother, his FBI partner, and an ancient thinblood sister. But, his most potent ally, his guardian angel, is forced to the sidelines by a threat as powerful as she.