My enemy's enemy? When a Crystal Skull is discovered beneath the Mesoamerican Pyramid of the Sun, it ignites a cataclysmic chain of events that maroons SG-1 on a dying world. Xal?tcan is a brutal society, steeped in death and sacrifice, where the bloody gods of the Aztecs demand tribute from a fearful and superstitious population. But that's the least of Colonel Jack O?Neill's problems. With Xal?tcan on the brink of catastrophe, Dr Daniel Jackson insists that O?Neill must fulfill an ancient prophesy and lead its people to salvation. But with the world tearing itself apart, can anyone survive? As fear and despair drive Xal?tcan into a frenzy of ritual murder, SG-1 find themselves with ringside seats at the end of the world? Special section: Excerpts from Dr Daniel Jackson's mission journal!