In the seedy underbelly of the Chicago supernatural scene is a club that no one talks about. The Patronus Ceteri have tolerated it for decades, but when club-goers start dying, the self-appointed protectors of the balance can't let it go. To get to the bottom of what's happening there, Sapphira, their newest and most powerful member, must ally herself with a wolf she's not sure she can trust, a troll she's been forbidden to see, and a ghost who can't...