A mystery and adventure story of medieval England, the setting the ancient Abbey of Glastonbury, the plot linked with the lost treasure and the Holy Grail. Two boys- one, the son of a nobleman involved in the slaying of Thomas a Becket, gone to the Holy Land to do penance, the other an oblate, who would far rather be of the world of chivalry than the world of monks- form a fast friendship, and stumble on the verge of discovery of the treasure, and are led into strange paths. The treasure of books themselves -- a vigorous background of period -- good story telling.