Eve Dallas and her multi-gazillionaire husband are at a swanky party with one of his society friends in one of his many New York hotels. Suddenly a naked man staggers in, clearly disorientated, covered in blood and clutching a knife. Eve traces the bloody footprints to another hotel suite, where they find a young woman clearly murdered in what appears to be intended as a Satanic ritual of some sort. The suite shows clear signs that quite the raucous party with food, drugs, wine and sex took place before the festivities were finished off with a spot of sexual assault and murder. The blood-covered man remembers absolutely nothing and has clearly been heavily drugged. As the crime scene is one of Roarke's properties and the security has been compromised, he is just as invested in having the crime solved quickly and the murderers apprehended as his wife.
There are hints of supernatural elements in this novella, as Roarke, initially going against the wishes of his wife, calls on a former flame, a woman who practises witchcraft in order to figure out who is responsible for the grisly murder. As this is a novella, the plot moves a lot more quickly than in the novels, and there is less of a presence from the supporting cast, with the notable exception of Dr. Mira, who helps Eve try to get through to the various individuals who may be able to shed light on the situation, but who have all been drugged into oblivion.