Kat Richardson is a nationally bestselling author of urban fantasies. A near-fatal accident gave private eye Harper Blaine a little something extra in her bag of tricks—she's a Greywalker, able to travel between the spirit realm and living world. In Possession, Harper helps a woman who doctors fear is possessed. As she digs deeper, Harper discovers other patients with similar symptoms and a shared connection to one of the most gruesome events in Washington State's history.