Song of the Crimson Flower by Julie C. Dao

From the acclaimed author of Forest of a Thousand Lanterns comes a fantastical new tale of darkness and love, in which magical bonds are stronger than blood.

Will love break the spell? After cruelly rejecting Bao, the poor physician's apprentice who loves her, Lan, a wealthy nobleman's daughter, regrets her actions. So when she finds Bao's prized flute floating in his boat near her house, she takes it into her care, not knowing that his soul has been trapped inside it by an evil witch, who cursed Bao, telling him that only love will set him free. Though Bao now despises her, Lan vows to make amends and help break the spell.

Together, the two travel across the continent, finding themselves in the presence of greatness in the forms of the Great Forest's Empress Jade and Commander Wei. They journey with Wei, getting tangled in the webs of war, blood magic, and romance along the way. Will Lan and Bao begin to break the spell that's been placed upon them? Or will they be doomed to live out their lives with black magic running through their veins?

In this fantastical tale of darkness and love, some magical bonds are stronger than blood.