Completed in the spring of 1951, The Silver Chair is the first book without the Pevensie children. Instead, Aslan calls Eustace back to Narnia together with his classmate Jill Pole. There they are given four clues to find Prince Rilian, Caspian's son, who had been kidnapped ten years earlier. Eustace and Jill, with the help of Puddleglum the Marsh-wiggle and many others, face great danger before finding Rilian.