Demon Hunts (Walker Papers, #5)

Seattle police detective Joanne Walker started the year out mostly dead, and she's ending it trying not to be consumed by evil. Literally.

She's proven she can handle the gods and the walking dead. But a cannibalistic serial killer? That's more than even she bargained for. What's worse, the brutal demon leaves no tracks. So, if Joanne is to stop its campaign of terror, she'll have to hunt it where it lives: the Lower World, a shamanistic plane of magic and spirits. Trouble is, Joanne's skills are no match for the dangers she's about to face-and her on-the-job training could prove fatal to the people she's sworn to protect....