Witch's Bounty - Ann Gimpel

One of three remaining demon assassin witches, Colleen is almost the last of her kind. Along with her familiar, a changeling spirit, she was hoping for a few months of quiet, running a small magicians’ supply store in Fairbanks, Alaska. Peace isn’t in the cards, though. Demons are raising hell in Seattle. She’s on her way to kick some serious demon ass, when a Sidhe shows up and demands she accompany him to England to quell a demon uprising.

The Sidhe might be the best-looking man Colleen’s ever stumbled over, but she doesn’t have time for him—or much of anything else. She, Jenna, and Roz are Earth's only hedge against being overrun by Hell’s minions. Even with help from a powerful magic wielder like the Sidhe, the odds aren’t good and the demons know it.

Sensing victory is within their grasp, they close in for the kill.