Muerte De La Luz by George R. R. Martin

Set on the dying planet of Worlorn, this science fiction novel explores themes of love, loss, and the passage of time. The story follows Dirk t'Larien as he responds to a mysterious summons from his former lover, Gwen Delvano, who is now entangled in a complex relationship with two men from the warrior culture of the Kavalar. As Dirk navigates the intricate social dynamics and the haunting beauty of the fading world, he is drawn into a web of intrigue and conflict, forcing him to confront his past and the choices that have shaped his life. The narrative weaves together elements of romance, adventure, and existential reflection, set against the backdrop of a planet on the brink of darkness.