Despairing because the air has become so filthy that it blocks the sun's rays, the richest man in the world decides to use his money to build a tower so that his grandson can experience the sun as it once was.
Tired of his mother's shouting and the noise of the city, Peter runs away to a beautiful garden, where he stays until he finds a way to bring a part of it home with him.
Every night for two years Peter searches in the library for the lost book on how to live forever, and when he finds it, he makes an important decision.