Bait and witch / Angela M. Sanders.

Enhanced descriptions from Syndetics:

Librarian Josie Way moved to small-town Oregon to lay low. Instead, thanks to newfound magic abilities-and a killer on the loose-she's leapt out of the frying pan and into a cauldron of trouble . . .

Josie Way loved working among the Library of Congress's leather-scented stacks-until she uncovered corruption and made herself a target. As Wilfred, Oregon's new librarian, Josie can stay undercover until the case goes to court. But life in this little town isn't as subdued as she expected. The library, housed in a a Victorian mansion, is slated to be bulldozed. Still digesting the news that her safe haven is about to become scrap lumber, Josie discovers a body in the woods . . .

Almost as shocking, Josie learns that she's descended from a long line of witches-and her powers have suddenly sprung to life. With help from a spoiled alley cat who just may be her familiar, Josie's thumbing through a catalog of suspects, hoping she can conjure a way to save her library-and her life. . .