At a future time in England when anyone knowledgeable about machines is severely punished as a witch, four children dare to aid in the escape of a "witch" left for dead.
- ISBN10 0385294514
- ISBN13 9780385294515
- Publish Date 1 May 1986 (first published April 1969)
- Publish Status Remaindered
- Out of Print 8 March 2017
- Publish Country US
- Imprint Delacorte Press
- Format Hardcover
- Language English