Once Bitten — Stephen Leather

As a psychologist for the Los Angeles police department, Jamie Beaverbrook has seen it all. Or so he thinks until the night a full moon brings out the crazies, including Terry Ferriman. Trouble is, Terry isn't exactly crazy. But how else can the police explain finding the girl in an alley off Sunset, crouched over a man's lifeless body, her mouth smeared with blood? After an interview that is unsettling at best, the good doctor decides to dig deeper into Terry's story. What he discovers is that a world he previously imagined to exist only in horror movies is actually flourishing in the shadows of L.A. Vampires are real, walking among--and feeding on--humans every day. Beaverbrook knows he should be frightened, but his fascination with Terry is all-consuming. And when he realizes that a shadowy government organization has captured several vampires, including Terry, Beaverbrook must decide just whose side he is on?