[Michlib-l] Trying to identify a book

Hello. I was approached by a patron today who was looking for the first book in a fantasy series she read about ten years ago. It was a series written for adults. It was set in a medieval-like Europe. There is an Irish witch traveling with her granddaughter and a former soldier. They stop at a nobleman's lands where there are mysterious killings. Eventually they discover (spoiler) that the murderer is a werewolf. Can anyone help us out? It isn't ringing a bell and I've exhausted the usual resources. Thanks so much! Elizabeth Elizabeth Campion, Librarian Shelby Township Library 586-739-7414