"The Hollow Hills" by Mary Stewart (Vintage Hardcover)

The Hollow Hills takes place in a fifth-century Britain fraught with superstition and fear, where no life is safe, no law is stable, and where a king risks accusations of murder and adultery to get himself an heir. For his own safety, the boy Arthur, rejected as a bastard by his father, is long kept ignorant of his parentage.

Vintage hardcover book published in 1973 by William Morrow & Company. Book Club Edition.