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The Silver Chair is a children's portal fantasy novel written by British author C. S. Lewis and published by Geoffrey Bles in 1953. It was the fourth of seven novels published in The Chronicles of Narnia (1950–1956), but became volume six in recent editions sequenced in chronological order to Narnian history. Macmillan US published a revised American edition within the calendar year. Like the others, it was illustrated by Pauline Baynes and her work has been retained in many later editions. The novel is set primarily in the world of Narnia, decades after The Voyage of the Dawn Treader there but less than a year later in England. King Caspian X is now an old man, but his son and only heir, Prince Rilian, is missing. Aslan the lion sends two children from England to Narnia on a mission to resolve the mystery: Eustace Scrubb, from The Voyage of the Dawn Treader, and his classmate, Jill Pole. In England, Eustace and Jill are students at a horrible boarding school, Experiment House. The Silver Chair is dedicated to Nicholas Hardie, the son of Colin Hardie, a member of the Inklings with Lewis, and was adapted and filmed as a BBC television series of six episodes in 1990.