The Witch of Clatteringshaws - Aiken, Joan 1924-2004 (Delacorte Press, 2005)
Dido travels to Scotland and, aided by Woodlouse and by Father Sam's cousin Malise, the Witch of Clatteringshaws, seeks another heir to the throne who can relieve her friend Simon of the burden of being king of England. -- 010 & up.