Autumn bones : agent of Hel / Jacqueline Carey.

Enhanced descriptions from Syndetics:

New York Times bestselling author Jacqueline Carey returns to the curious Midwest tourist community where normal and paranormal worlds co-exist--however tenuously--under the watchful eye of a female hellspawn…

Fathered by an incubus, raised by a mortal mother, and liaison to the Pemkowet Police Department, Daisy Johanssen pulled the community together after a summer tragedy befell the resort town she calls home. Things are back to normal--as normal as it gets for a town famous for its supernatural tourism, and presided over by the reclusive Norse goddess Hel.

Not only has Daisy now gained respect as Hel's enforcer, she's dating Sinclair Palmer, a nice, seemingly normal human guy. Not too shabby for the daughter of a demon. Unfortunately, Sinclair has a secret. And it's a big one.

He's descended from Obeah sorcerers and they want him back. If he doesn't return to Jamaica to take up his rightful role in the family, they'll unleash spirit magic that could have dire consequences for the town. It's Daisy's job to stop it, and she's going to need a lot of help. But time is running out, the dead are growing restless, and one mistake could cost Daisy everything…