This is book 2 in a series. You’d be better off starting with Dead Witch Walking.
Rachel Morgan has successfully paid off the IS death threat and is in her third month of working as an independent runner. She still doesn’t have a car, however, and hates relying on public transport or rides from friends to get around. She’s also struggling to pay her bills from month to month, so when a werewolf pack refuses to pay her for snatching their pet fish back from another clan, she’s in a bit of a bind. The FIB, the human-led, non-supernatural police force approach her for help on a new and potentially dangerous case.
There is a serial killer stalking Cincinnati, targeting layline witches. It seems the deaths occur around the full moon of every month. The FIB suspect one of the layline witches who teach at the University, and want Rachel to take one of her classes, to be able to more closely observe the woman. Rachel is deeply unhappy with the idea, as she’s been flunked by this woman once before. She deeply distrusts layline magic in general and believes herself to have no aptitude for it. But as her paycheck from the FIB relies on her going back to school, she reluctantly agrees. Rachel, however, has an alternate suspect in the murders. She believes Trent Kalamack is behind the deaths, and works hard to find a connection between him and the victims, so they can get a search warrant for his compound.
Kalamack, however, professes his innocence and claims he is being framed by someone very powerful. He even offers to pay Rachel to clear his name. Speaking to him, she figures out that the demon attacks that she and Trent both survived a few months ago are connected to the case, and that they were in fact supposed to be the killer’s first victims. Much as she dislikes and distrusts Trent, even Rachel doesn’t believe he’d have himself nearly killed by a demon to prove his innocence. She needs to go looking for the murderer somewhere else, but is an individual powerful enough to summon an demon to kill for them someone she wants to go chasing after?
Full review on my blog.