Broken Angel by Brian Knight

She was a mystery from the start.

They found her at a roadside diner outside the small Idaho town of Clearwater, drugged and abandoned, with no memory of who she is or where she came from.

But was she a miracle?

She inspires violence with her presence, madness with a touch.  As her health improves and her memories return, the hot Clearwater summer becomes increasingly strange and violent.  Insanity infects the small town, a shadowy figure lurking in the woods deals death, and no one is safe.

“The author of Dragonfly and Feral shows his skill at small-town horror." Library Journal.