For thirty-two years, archaeologist Julius Gabriel investigated the Mayan calendar, a 2,500-year-old enigma that predicts the Apocalypse. His research led him to believe that ancient constructions like the Great Pyramid, Stonehenge, Angkor Wat, and Chichen Itza, were all built as part of a primeval fail-safe system, that might save humanity from total annihilation. But now Julius is dead, and his theories have perished with him, discredited and ridiculed. With the help of Dominique, a part-Mayan psychiatric intern, Julius son, Michael, breaks out of an insane asylum in Miami, where he has been illegally imprisoned. Together they flee to the Yucatan Peninsula, where Michael believes he can find the evidence he needs to prove his father's theory, and to convince the world of the fast-approaching global catastrophe. In Mexico, at the autumn equinox, a serpent's shadow appears over the northern face of the Temple of Kukulcan, as it has done for a thousand years. But this time is different – it is the beginning of the end...
