Harry Dresden is now one of the wardens of the White Council of wizards, and he’s about as thrilled about it as many of the wizards on the council are about him being recruited. Harry’s asked to look into rumours of black magic in the Chicago area, and his mentor, Ebenezer McCoy, also requests that he enquire with his faerie contacts about why the Fey Courts are refusing to involve themselves in the conflict with the Red Court of vampires, even after the vampires broke into faerie territories in the Nevernever.
Harry still owes Mab, the Winter Queen, two favours, and his dealings with the Fey never really turn out in his favour. Lily, the new Summer Lady (youngest of the three Summer Queens) owes him a favour, but neither she nor Fix, the Summer Knight, can directly answer Harry’s questions, or aid him, due to a compulsion laid on them by Titania, the Summer Queen, who’s not exactly one of Dresden’s biggest fans. Getting the answers McCoy wants isn’t going to be easy.
The possible black magic use he’s been asked to investigate seems connected with mysterious attacks at a horror movie convention. Molly Carpenter, the teenage daughter of Harry’s friend Michael, comes to him for help. Her boyfriend is the chief suspect after a man was viciously attacked in a bathroom, but claims he’s innocent. Shortly after Harry arrives at the convention to investigate, a number of people are attacked by a seven foot tall assailant who looks just like the killer in the slasher flick recently screened.