Of Santa and Slaying by Jessica Lynch

Christmas is a time for family…

At least, it should be. But when your uncle is the head of the Society of Slayers, you’re an ex-slayer, and your new mate is a vampire? The looming holidays are a lot more complicated than should be.
When her Uncle Boone calls a couple of days before Christmas, Tabby is sure Society business will keep him away from the holiday dinner she’s hosting for her small family. To her surprise, he actually wants to hire her and Adam for a quick assignment. And while her uncle has outsourced a job or two to their Paranormal Investigations agency, something about this one hits differently.
Nightwalkers that go rogue are dangerous. Every slayer knows that, and Tabby’s specialty has always been hunting the human-turned-vampires who give in to their bloodlust and leave nothing but drained bodies behind. But the killer vamp on her uncle’s radar? He’s using the holiday to lure his unsuspecting victims close.
Turns out, this year, Santa isn’t sticking to milk and cookies. He’s snacking on humans instead…
And that’s not all. When Adam ties some disturbing packages he’s been receiving lately to the small town the fanged Kris Kringle is terrorizing, the mated couple realizes its a trap laid especially for them. An old enemy has resurfaced after Priscilla Winters’ defeat, but the self-proclaimed Nightwalker queen doesn’t want to take Cilla’s place.
She wants to take Tabby’s.