Throne of Glass follows the story of Celaena Sardothien, a 18-year-old assassin who was once Adarlan's most feared killer. After a year of imprisonment in the harsh salt mines of Endovier, Celaena is given a chance to compete against other thieves and assassins to become the King's Champion. The winner will serve the ruthless King of Adarlan for a period of four years in exchange for their freedom.