Ciara's Song - Andre Norton

In Karsten, Ciara of Elmsgarth is only a small girl when the edict is carried out to kill all with Witch blood, and take all they own. As a mob murderers her family, Ciara is rescued and protected by the powerful Lord Tarnoor and his son, Trovagh. As the years pass, Ciara and Trovagh grow to love each other and marry, raising children of their own. Then an evil sorcerer rises to power, and his vendetta against Ciara threatens all she loves.