Visitor

"Visitor" is the fourth novel in the Mike Murphy Park Ranger series. In the novel a Grand Sachem, Tarhe, is sent back to perform several good deeds to make amends for things he did as a young warrior. One of those good deeds involves rescuing a young lad. This young lad is destined to become a scientist whose desire is to build underwater cities to help ease the world's over population on land areas.