"Throne of Glass" is a young adult fantasy novel by Sarah J. Maas. It follows the story of Celaena Sardothien, a skilled assassin who is imprisoned in the salt mines of Endovier. She is offered a chance at freedom by competing in a deadly competition to become the king's champion. As Celaena navigates the challenges of the competition, she uncovers dark secrets about the kingdom of Adarlan and its magic. The novel explores themes of power, loyalty, and identity, while introducing a rich cast of characters, including Dorian Havilliard and Chaol Westfall.