Cousins Sam, Yoder and Mike, aka the Archeo's are back in Merlyn's Cavern and find things that astound them. Yoder stumbles on how to remote view anything he sets his mind to see. Mike finds the secret to unlocking the writings in the "Book of Magic" that Sam has been struggling to understand. Sam finds the shroud of invisibility. Then they all find Merlyn taking up residence in their minds. Not only can Merlyn communicate telepathically with them he can again see the world but only through the eyes of the Archeo's. It is a blessing for all involved. With new powers of remote viewing, seeing in total darkness and the fourth dimension, along with the ability to see both telescopically and microscopically using Merlyn Vision they set out with their grandfather, the imminent archeologist Dr. James Michaels, to discover the secrets of Machu Picchu. Finding "The Eyes of Mother Earth" the Archeo's make an unimaginable discovery. "The Eyes of Mother Earth" is actually a Star Gate that holds the secret to what happened to the Incas of Machu Picchu. While investigating the Star Gate they learn their grandfather has been kidnapped by Peruvian guerilla fighters and has been terribly wounded. The fight to save their grandfather, and unravel the secret of the lost Incas results in revelations none of them could ever have anticipated.