Evil Unveiled — Robert R. McCammon

In the Carolinas of 1699, after sentencing Rachel Howarth to death by burning, Matthew, the young clerk of magistrate Isaac Woodward, embarks on his own investigation into Rachel's claims and discovers that he must conquer a powerful and evil force to free Fount Royal from a terrifying menace and exonerate a virtuous woman, in the second part of a two-part novel. Reprint.