The Silver Chair is the first Narnia book without the Pevensie children. Instead, Aslan calls Eustace back to Narnia together with his classmate Jill Pole. There they are given four signs 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, face great danger before finding Rilian, held prisoner in an enchantment by a Green Witch..