One village, Aberglais in Wales, one forest: lives linked across time. A drama which unfolded there in the thirteenth century can only be resolved today. Clues left hidden by a medieval monk lead schoolboy Tom Rhys and his school-friend, Beth Jones, to an incredible discovery. Down the centuries nobody knew how the legend of King Arthur was locked in the past of Aberglais. In the twentieth century, Tom, Beth and their school-friends unravel the mystery, placing themselves in great peril as they do so.