The Hardy boys track a criminal who plans to use an invention designed as a peaceful aid to the secret Four-Headed Dragon organization behind the Iron Curtain to harm the free world instead.
- ISBN10 000691828X
- ISBN13 9780006918288
- Publish Date 14 July 1983 (first published 1 October 1981)
- Publish Status Out of Print
- Out of Print 16 August 1991
- Publish Country GB
- Imprint HarperCollins Distribution Services
- Edition New edition
- Format Paperback
- Pages 192
- Language English