A followup to A Circle of Stones (1999)—which traced the origins and history of the medieval Welsh prophet Madoc—this account moves back and forth between the Old World and the New, providing a good deal more shading to the picture that was sketched out previously. Madoc, a Druid chieftain, was the son of Prince Owain and prophesied to be the savior who would lead his people to victory over the rising tribe of Christians, who were growing daily in wealth and influence and began (in the 12th century) to drive the Druids from their native lands. A marked man from birth (when was there ever a savior who didn’t have a line of assassins waiting for him?), Madoc was taken from Wales while still a baby by his valiant mother Brenda, and later sojourned in France and Iceland before making his way to America (some 300 years before Columbus) and settling with a band of his followers among the peaceful non-Christian natives of that happy prelapsarian realm. Eventually, he became father to a people of his own—the Welsh-speaking, blue-eyed Mandan tribe who inhabit the Dakotas to this very day.
Heavy on the New Age mysticism: it'll appeal to fans but make few converts.