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 . . .