When Dr. Charles Tapper is not researching books, he’s spending time digging holes. That is to say; he’s a renowned archeologist whose ancient finds have been displayed the world over. On this occasion, he’s digging for artefacts along the Orinoco River in Venezuela. While digging for ancient potteries that he believes belonged to the Mayan civilization, one of his ‘boys’ finds a green gem of extraordinary size. Dr. Tapper can’t believe his luck. This might be one of the gems that had adorned the headdress of the priests residing in Chi Chen Itza. Yet, when the men in his crew find the necklace to which the emerald belongs, they’re terrified, for it hangs around the neck of a skeleton. The remains have only been in the ground for twenty years or so. After discovering dozens of skeletons at the bottom of an abandoned well, and almost losing his life when climbing down the shaft, Dr. Tapper manages to solve the mystery of the Emerald Woman.