The ancient crystal skulls found in the jungles of Central America exude an air of deep mystery and supernatural strangeness. Were they made by a mysterious race of advanced beings in remote antiquity - a race with paranormal powers? Tom Powell, an introverted Englishman, and Molly Beale, a streetwise New Yorker, stumble upon one of the skulls lying among the charred, still smouldering remnants of three human corpses on top of the Temple of Warriors in Chichen Itza in a remote province of Mexico. In consequence they are flung headlong into a desperate quest to uncover the secrets of the macabre relics - a quest that will take them right around the world, battling all the way against the forces of evil, to a climactic confrontation at a site sacred through untold ages of humanity. And to something awesomely more than human...