Eric and Julia seek tree grafts on the outskirts of their medieval eastern European village as a summer storm gathers. Sullya, a witch hiding among the trees, grabs Julia. Eric swings his axe and severs Sullya's hand from her arm. The witch seeks refuge in the deep bole of an old oak. Her hand falls onto the same oak and crawls up the trunk to join her.
Eric wants to flee but Julia, believing they're safe thanks to the now heavy rain, torments the witch. Sullya curses them, their families, their crops, their livestock, and their village.
Soon crops wilt, livestock die, and much of village falls ill. The village priest, Father Baillot, seems ignorant of church ways and proves ineffective against the curse.
The village elders seek help elsewhere, specifically from a distant priest, Father Patreo, who knows the Old Ways as well as the New. Patreo is out of favor with the Church because he makes no effort to hide his belief that progress comes from exploring all paths, not just those the Church decrees acceptable.
He and Verduan, one of the village elders, investigate and encounter witchcraft, devil worship, murder, a coup d'etat, and the clashing of three great cultures. What they discover changes the face of Eastern Europe forever.
