Follows two young detectives through an investigation and introduces such tricks and techniques as mirror writing, codes, invisible ink, fingerprinting, and other tools of the trade.
- ISBN10 0816706727
- ISBN13 9780816706723
- Publish Date 1 January 1986
- Publish Status Out of Print
- Out of Print 5 October 2021
- Publish Country US
- Imprint Troll Communications
- Format Hardcover
- Pages 47
- Language English