Caitl n Matthews is a writer, singer, and teacher. She is acknowledged as a world authority on Celtic wisdom and the ancestral traditions of Britain and Europe. John Matthews is a historian, folklorist, and author. He has written more than ninety books on the Arthurian legends. He was the historical advisor to Jerry Bruckheimer's film King Arthur. The Matthewses are also the authors of Trick of the Tale. They live in England.