Irene Weinhardt's father, renowned physicist Kenneth Weinhardt, has been officially declared dead. But his body has never been found. When the Hardys agree to help Irene investigate her father's fate, they discover that his supersecret research into superconductors may have been worth millions, making him a select target for foul play!
- ISBN10 0671561219
- ISBN13 9780671561215
- Publish Date 1 March 1997
- Publish Status Active
- Out of Print 12 February 1999
- Publish Country US
- Publisher Simon & Schuster
- Imprint Pocket Books
- Format Paperback (A-Format (178x111 mm))
- Pages 160
- Language English