A gold medallion is discovered in a lump of coal over a hundred million years old. It contains a code describing human DNA at a time when there were no humans. How could this be? Adam Dove wants to know, but when he starts to investigate, his laboratory is destroyed and a close friend is murdered. Joined by a brilliant biochemist, Linda Garcia, the two are hunted by a Nazi underground bent on retrieving the disk and a mysterious alien presence, which may be more interested in destroying it. Adam and Linda face the most difficult decision of their lives-to leave all they know behind for the chance to discover mankind's origin and purpose.