When young artist Peter Davis and his family move to the mountains of North Wales, he anticipates a quiet and comfortable living as he captures the scenery on canvas. Before he can settle into his new home, Peter finds himself experiencing the history of the area through the eyes of an Archdruid who lived there two thousand years ago. Gradually, Peter is pulled into the past where he relives the desperate struggles of the ancient Celts against their Roman conquerors in an era of bloodletting and supernatural worship. He becomes a key figure in the Ancient British revolt against Roman rule, while finding himself battling an evil so powerful it threatens to envelop both his worlds and to consume his family.