Urban Shaman by C. E. Murphy

Joanne Walker, born Siobban Walkingstick, is returning to Seattle from her Mother's funeral in Ireland. On the plane home, as pilots are making a final pass into the city, she sees a woman being attacked at a church. After her plane lands she finds the first cab and tries to discover if what she saw was real or her imagiation. She is a mechanic-cop for Seattle PD. She discovers that she is becoming a shaman.

In her search for the truth she runs head on into Cernunnos, an ancient Celtic god and leader of the Wild Hunt. She has three days to learn to use her shamanic powers and save the world from the unleashed Wild Hunt. No worries. No pressure. Never mind the lack of sleep, the perplexing new talent for healing herself from fatal wounds, or the cryptic, talking coyote who appears in her dreams. Will she decide to ride with the hunt or work to destroy them?

This was a pretty good read. It took me several weeks to read it so it really didn't grab me but I wanted to finish it.