"The Last King of Osten Ard" is a fantasy novel by Tad Williams, set in the richly imagined world of Osten Ard. It follows the story of Simon, a young hero, as he navigates a realm filled with magic, political intrigue, and ancient prophecies. The narrative explores themes of loyalty, sacrifice, and the struggle against dark forces threatening the land. The book is part of the larger Osten Ard series, which includes earlier works like Memory, Sorrow, and Thorn. It continues to develop the intricate lore and character arcs established in previous novels, appealing to both new readers and long-time fans of the series.