It tells a tale about how an emissary from the Spirit of Nature arrives in the early days of industrialization, in the form of a young troll, to judge humanity's fitness for survival, or to doom us to extinction. The evil intrigues of men bent on eradicating the last of the trolls are offset by profound epiphanies as Ogden grows and matures from a callow babe in the woods into a burly troll who communes with the spirits of Nature.

Through many adventures he learns the similarities and differences between the black magic of men conjured through deceit and clever technology and the life-affirming magic of Nature expressed in ways mysterious and infinite.