After bringing the corruption of her former boss at the San Francisco office of The Protectorate to light, and getting him fired, Alma Bellrose is dismayed to learn that a famed demon hunter will be replacing him. She knows that they keep tabs on her and the changeling she once saved from execution, Sebastien, so to distract The Protectorate she agrees to go undercover at a week-long party hosted by well-known witches. Right off Alma knows something is wrong when she doesn't see any fae on the property, a sure sign that a "demon", or more correctly, a possessing spirit is present. But seriously, all of these people are behaving suspiciously, except the actual "demon," and it's not long until the bodies start to pile up, starting with the hostess apparently committing suicide.