When the strange hourglass-shaped time machine crashed out of the twentieth century and into the Caribbean Sea of fourteen hundred years ago, Neil Falsen realized how unprepared he was to head the expedition that his father had organized back through time. Of the four men who had flown through centuries to solve the mystery of an ancient Mayan god, two had died in the shattering crash. Only Neil and ship's pilot Dave remained to cope with the language and customs of a people who had disappeared into the darkness of history. It was confusing enough not to know which century the machine had fallen into. But Neil was sure his eyes were playing tricks when he spotted a Norse ship cutting proudly through southern seas. How ancient Vikings, Mayas and two twentieth-century Americans met - and fought - amid the splendors of a civilization that today dots the Yucatan peninsula of Mexico with its ruins, makes a tale as unique in telling as it is in content. In scenes that throb with drama and thunder with excitement, Dave and Neil found frightening evidence of the approaching Mayan collapse. With a common modern device, Neil stepped into a tense religious ceremony to prevent human sacrifice. Without realizing it, he discovered the secret of the white god among the Mayan Indian dieties. One of history's most intriguing suppositions forms the basis for this tale of the secret behind the legend of a lost civilization.