Sight Unseen IV — James M. Matheson

On vacation in New England, Katie Pearson is leaving her work behind for a few days. Flipping houses for a living has brought her happiness, and romance, and more than a little bit of horror. Ghosts inhabit old houses sometimes, and the dead aren't always at rest. In a historical town in New Hampshire, Katie finds a chance to maybe flip one more property. Even though she's on vacation she's intrigued by the story of the women murdered as witches so long ago. She wants nothing to do with any of this. After reading the old dusty books in the town library, she realizes she may not have a choice. Evil may run deeper in Twilight Ridge than anyone realizes.