Camelot in orbit
Arthur H. Landis (Author), Don Maitz (Illustrator)
"Camelot was their name for it, and Kyrie Fern was their Adjustor on its surface -- a knight in truly shining armor, a champion of chivalry, and the only one who actually stood between the Arthurian natives and the alien being that menaced both their world and the advanced planets that swung unseen through their sky"--Back cover