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.
- ISBN10 0679983341
- ISBN13 9780679983347
- Publish Date 7 April 1997 (first published 7 November 1996)
- Publish Status Active
- Publish Country US
- Imprint Alfred A. Knopf Books for Young Readers
- Edition American ed.
- Format Hardcover
- Language English