Secondhand Spirits by Juliet Blackwell (2009)

Subtitled: A Witchcraft Mystery, this is a charming light mystery about a woman with some witchy powers who runs a vintage clothing store in San Francisco. I loved the mysterious back story of the main character (it's so refreshing when an author doesn't give you all the information right away). It also features handsome romantic interests, evocative San Francisco setting, and a really serious treatment of the seriousness of magic that you don't see in your usual paranormal novel. An unexpected treat.