Merry Owen is desperate for her family to stay on their struggling farm in Wales, in the shadow of the Black Castle, owned by the de Courcys who have been enemies of Merry's family for generations.

Skilled in the family tradition of archery, Merry is happiest out riding, but when she finds an overturned tree and a buried chest containing an ancient Welsh text, it leads her into a past filled with treasure, secrets and untold danger