John G. Hartness - Black Knight Chronicles (#1-3)

Black Knight Chronicles #1 Hard Days Knight
Children are missing.
The police are stumped.
Halloween is coming, with an ancient evil on the horizon.
The vampires are the good guys.
This is not your ordinary fall weekend in Charlotte, NC. Vampire private detectives Jimmy Black and Greg Knightwood have been hired to keep a young client from being cursed for all eternity, but end up in a bigger mess than they ever imagined.
Suddenly trapped in the middle of a serial kidnapping case, Jimmy and Greg uncover a plot to bring forth an ancient evil into the world, and enlist the help of a police detective, a priest, a witch, a fallen angel and strip club proprietor to save the world. This unlikely band of heroes battles zombies, witches, neuroses and sunburn while cracking jokes and looking for the perfect bag of O-negative

Black Knight Chronicles #2 Back In Black
Vampire detectives Jimmy Black and Greg Knightwood investigate a series of assaults plaguing the alleys of Charlotte. Along the way they battle trolls, bigotry, fairies, dragons and small minds on the way to a knock-down battle royal inside a steel cage. The boys find themselves fighting evil in alleys, trolls in bars, dragons in FairyLand, and trying to scrub the sparkle off after a battle with vicious Fae in the hall of the Fairy Queen.
Yeah, really. All that and vampires, too.

Black Knight Chronicles #3 Knight Moves
Vampire private investigators Jimmy Black and Greg Knightwood find another vampire (or more) playing in their sandbox, and the boys are NOT happy about it.
While tracking down the killer of a young college student, they encounter boobytraps, defenestration, coeds, a hirsute bounty hunter with a moon fetish and a bad attitude, and worst of all - game night at a comic shop