A walking stick that follows you around is surely a sign to slow down, right?
Mercy is asked to help investigate a series of Fae murders, because mechanics are great at that sort of thing. That goes so well that her friend and former boss, Zee, ends up on the hook for a murder he didn't commit. Of course, what happens on the rez stays on the rez, so the Fae are quite happy for Zee to take the fall. Mercy isn't happy for Zee to take the fall.
Patricia Briggs keeps upping the ante with this series. Mercy may have some devoted friends but there is quickly becoming very few groups in the Tri-Cities area that aren't pissed at her. Whether it be the vampires, the Grey Lords of the Fae, her two competing suitors, elements within the wolf pack, or the local anti-magical beings hate groups, Briggs has made Mercy's life tough. This makes for compelling reading. Some people won't like the climatic scene for how far it goes, but what is a decent protagonist without deep psychological scars? <--- not a spoiler... kinda.