Back in Black — John G. Hartness

Vampire detectives Jimmy Black and Greg Knightwood investigate a series of assaults plaguing the alleys of Charlotte, North Carolina. The string of hate crimes becomes personal when Jimmy's just-maybe-main-squeeze Detective Sabrina Law's cousin is attacked. Helping a lady out could get the boys killed when they end up in Faerie. Before long, they're up to their butts in trolls, dark fae and a grand battle royale.  The odds are against them, but to the boys, this is just another day on the night shift -- if the night shift included a steel cage match of supernaturals.