The story follows Mia Corvere, a young woman seeking vengeance for her family's downfall in a dark, gritty world where three suns rarely set. Trained as an assassin by the Red Church, a ruthless school for killers, Mia harnesses her unique ability to manipulate shadows. As she navigates the treacherous politics and deadly trials of the Church, she uncovers secrets about her past and the true nature of her powers, all while grappling with her desire for revenge and the moral complexities of her choices.