In 1205, a faithful knight was excommunicated for using his powers as a warrior witch to battle evil. Joining forces with other witches, he started a fellowship and for ten years led his brothers into battle against demons. Then he was captured, tortured and killed by the demoness, Cassia. His companions, calling themselves The Warriors of Sir Guy, hunted and destroyed her, but her offspring by Sir Guy fled. For eight hundred years The Warriors of Sir Guy have tracked the half-demon, vowing not to rest until the creature is destroyed. Born with the powers of a warrior witch, Robin was sent as a boy to train with the fellowship. Now a man, he is on the verge of fulfilling his coven's quest for justice by slaying the half-demon child of their founder. No one realizes that the offspring is his father's son. Only Robin sees the good in him. When he warns Robin that demons have infiltrated the Warriors of Sir Guy, the lovers are thrust into a battle that might destroy them.