Half Bad by Sally Green

In a world divided between Black and White witches, sixteen-year-old Nathan Byrn is the one thing feared by both sides — the illegitimate son of the most powerful and violent Black witch alive. Trapped, hunted, and imprisoned by the Council of White Witches, Nathan endures brutal captivity as he struggles to discover who he truly is. Freedom comes at a terrible price, and survival depends on finding the one person who can give him the gift that will define his power. Torn between good and evil, love and vengeance, Nathan’s journey becomes a fight not just against his captors, but against the darkness growing inside him.