Spiral Hunt - Margaret Ronald
First of all I am an amateur Ancient Celtic Myth and Historian and this book...wow. Ronald did her research and her homework and she owned it. The history and the myths come out strong without sounding like they were planted in the plot to explain something (while sounding like an encyclopedia) but both were woven into the story and the characters and became one.

Evie Scelan is a Hound - her magic is of the olfactory kind. She can smell a 'church by daylight" (to quote Shakespeare) and due to her magic/talent she is sought by those that know her talent to find lost things; things like manuscripts, stones, books.

Until her first love calls her in the middle of the night to say good-bye while a voice that is his but it not his warns her that the Hunt is on. The Brotherhood of Light - a group of "magicians" who have taken the Fiana name and bastardized it are after her and her talent. They are creating loci and avatars and they will bind them to their corrupted will.

Evie, messenger by day, sometimes police consultant and PI of sorts, must choose a side in the dark undercurrent that is fast threatening to enshroud everything she has ever known She must choose a side or run.

There are a cast of supporting characters that shine just as well as Evie, even those that are merely fringe characters and the betrayals and the twists are made even more real for it.

With a mysterious but attractive magic adept, her best friend and hedge-witch and a friend who could/might've been so much more offering you something you can't take. Who do you trust when anyone could be a bad guy?