The Castles of Athlin and Dunbayne by Ann Radcliffe

THE CASTLES OF ATHLIN AND DUNBAYNE describes a long-running feud between two powerful Scottish clans in the Middle Ages. The clans inhabit a remote stretch of Scottish Highlands coast, where the Earl of Athlin’s son, Osbert, vows to avenge his father's death at the hands of the despised Baron Malcolm of Dunbayne twelve years earlier.