Dead Heat (Rabun County #3)
Lisa Clark O'Neill

But as the incidents become more targeted, the coincidences increasingly cruel, Charlotte begins to suspect that someone is deliberately using her family history of psychosis to torment her for their own ends. Escaping to the serene waters of Lake Rabun, she first runs afoul of the local sheriff, Ethan McCloud, before finding it necessary to enlist his aid.
Is Charlotte being stalked, or is she simply paranoid? Because sometimes the most treacherous depths are in our mind.