The Castles of Athlin and Dunbayne

Following her husband's death at the hands of the Baron of Dunbayne, Lady Matilda retired to her castle to raise her children. Now a young man, her son Osbert swears to avenge his father's death. On a trek through the Highlands, he meets a man with a shocking secret. The Castles of Athlin and Dunbayne is a novel by Ann Radcliffe.