Book 4 in the Rachel Morgan series, this one takes place almost entire out of Cincinnati. Rachel, having been "dead", is now the Alpha in David's pack. Since it's just the 2 of them, and Rachel is a witch not a were, it's all a formality. Members of other packs don't see it as such and end up challenging Rachel to a fight. She nearly loses without use of her magic and is determined to find a spell to change her to a wolf so she can fight again.
In the meantime, Jenks and family are still living away from the church, after not being told that Trent was an elf. Jenks' wife does come to Rachel and Ivy for help though. Their son, Jax, is missing and presumed with Nick, Rachel's ex. Nick, it turns out, is a common thief and got Jax involved in that life. Rachel and Jenks make up enough to go after them, in Michigan.
A true adventure starts, leading them into several joined packs of hostile weres and other vampires. Rachel ends up performing quite a bit of demon curses in order to save the world from the power of an ancient were relic.
A really great & fast moving book.