Book 1 of the Demon Accords.

Chris Gordon is a rookie with the NYPD--one with a secret. In his spare time Chris is an exorcist without equal, with a gift from God. But when he saves a beatiful girl from a demonic attack, he discovers there is more to fear than just demons. Finding himself surrounded by vampires and were-weasels and facing a giant short-faced bear, Chris struggles to stay alive, all while protecting his deadly new girlfriend. And then there's her overprotective vampire mother!