Nail Biter by Sarah Graves

The ninth title in Sarah Graves's bestselling Home Repair is Homicide series, Nail Biter opens with a group of self-styled "witches" that has taken over an Eastport, Maine waterfront resort for Halloween. Jacobia "Jake" Tiptree is called on to answer his new tenants' multiple demands-many dealing with supernatural moaning-but she would rather be excavating an unusual discovery she made in the foundation of her 1823 Federal-style home. Instead, when a fundamentalist preacher turns up dead and all eyes turn to the witches, Jake's soon up to her eyeballs in trouble.