This reimagining of a classic Welsh myth begins on the mystical isle of Annwfn, where the souls of the dead are reborn to live in eternal peace. This serene afterlife is ruled over by Arawn, the trickster king of the dead, and his wife Mallt — huntress, autumn goddess, and warrior.But now Arawn has returned from a hunt strangely changed, and the balance of life and death has been disturbed. As Mallt uses her wits and divine songcraft to hold their kingdom and her marriage together, she faces not only a challenge to the order of the worlds, but to her own honour.