When he lands among the warring clans of the Irish hills, the Taelon scientist Ma'el is immediately cast into mortal danger...until he meets a young Celtic warrior who will lay down his life for the mysterious this stranger, and a druid priestess with uncanny insight. Together with the alien, they set out on an incredible journey, around the planet and to a destiny greater than the humans can possibly imagine. For Ma'el has come to judge Earth, and their travels will have consequences far into the future--consequences that will change both humanity and the Taelon race forever . . .