Forced by her parents to become the Lord of Fertility's bride, apothecary Bella enters an ancient marriage rite determined to find her missing older sister. The trials lead her into a forbidden cavern, where the ceremony awakens a sleeping god. With her sister still missing and an ancient presence stirring around her, Bella must discover what this marriage truly demands. Her vow has opened a door she cannot simply close, and every step toward the truth draws her deeper into the danger she has awakened.