The Stones of Camelot - Brian Stableford

The Stones of Camelot tells the story of Amory, a boy who was once taken into Faerie as a changeling, but then returned. While being cared for and educated by the Sisters of Saint Syncletica, Amory becomes preoccupied with the mystery of his origin, wanting to know why Faerie rejected him. When Amory travels with the wizard Merlin to Camelot, he is determined to find out what he want to know. Morgana Le Fay helps him to do that, at a price, but in so doing, causes the fall of King Arthur's fragile kingdom. Amory escapes into Faerie with Morgana, where he sets out to penetrate a secret that even Merlin dared not uncover: the mystery of the Dark Land, which lies within Faerie just as Faerie lies within the human world.