Nyra Voss is the kingdom’s deadliest assassin, known only as the Black Thorn. She exists in the shadows, carrying out kills without emotion — until the night she is sent to assassinate a high noble at the royal gala. When she finds the target, she instead finds Y/N L/N, the royal healer, kneeling beside the injured man and fighting to save his life. Something about Y/N stops Nyra from killing — and begins an obsession she cannot control. Drawn back to the palace after every mission, Nyra finds herself craving the healer’s warmth, kindness, and unwavering light. But Y/N is promised to Prince Cassian, and Nyra knows she will never be anything more than a shadow. As Nyra fights against her own darkness, the prince’s growing possessiveness, and a mentor who wants her to remain a weapon, she must decide whether to walk away… Or burn the world down to keep the one life she was never meant to love.