The final battle for the Sun Union begins-not with swords, but with poison in the soul.Zahara and Kato have built a sanctuary from exile and hope: the Sun Union, bound by a single revolutionary law-belonging. But their hard-won peace is shattered when a hidden enemy resurfaces, wielding not armies, but alchemical blight and spiritual decay.As Zahara and Kato venture into the lethal Shattered Labyrinth to confront the fanatical alchemist Kael, their son Bayo is left to guard a valley sickening with doubt and betrayal. With a traitor moving unseen among them, Bayo must step out of his parents' shadow, uncover the conspiracy within, and forge desperate alliances with elusive clans of wind and stone.In a war fought with whispers, charms, and creeping poison, the true test is no longer strength of arms, but strength of heart. The heir must become the Unifier-or watch the dream of unity crumble from within.Throne of the Sankofa Heart-Book 4 concludes an epic tale of resilience, legacy, and the unbreakable bonds that turn refuge into home.