Everything you need to understand or teach The Merlin Conspiracy by Diana Wynne Jones.
"The Merlin Conspiracy" is the story of a young boy and girl, who must protect their different worlds from a magical conspiracy. The book begins from the point of view of Roddy, an adolescent girl who lives in a magical world and has a close friend, Grundo, who she looks after as he is considered rather slow. At a meeting of the English king with the Scotch king, however, the Old...