While flying a kite on a hill, two children named Stevie and Nancy are swept away aloft by their kite in sci-fi fashion to a fantasy, wonderland-type world called Agapeland. It is a lush green place near a river, containing over-sized mushrooms, living plants, and friendly woodland animals. Shortly after their arrival in the pleasant Agapeland, Stevie and Nancy discover the Marvelous Music Machine, which Stevie explains is a "quanamatic digilator." Stevie tries to make it work, but only succeeds in causing it to produce a loud noise, which shoves him back into the Music Machine's caretaker (possibly creator), The Conductor.
Nathaniel the Grublet tells the story of a young boy Grublet, his dog Snuggles, and his brothers who live on the outskirts of Agapeland. Faced with the temptation to earn a living by stealing like his five dishonest brothers, Nathaniel must choose to live like them or do what he knows is right. Only when he meets "Majesty" does Nathaniel's life begin to change.