|   Original edition | |
| Author | Franklin W. Dixon | 
|---|---|
| Language | English | 
| Series | The Hardy Boys | 
| Genre | Detective, mystery | 
| Publisher | Grosset & Dunlap | 
| Publication date | January 1, 1950 | 
| Publication place | United States | 
| Media type | Print (hardback & paperback) | 
| Pages | 174 pp | 
| Preceded by | The Sign of the Crooked Arrow | 
| Followed by | The Wailing Siren Mystery | 
The Secret of the Lost Tunnel is Volume 29 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap.
This book was written for the Stratemeyer Syndicate by Andrew E. Svenson in 1950. [1] Between 1959 and 1973, the first 38 volumes of this series were systematically revised as part of a project directed by Harriet Adams, Edward Stratemeyer's daughter. [2] The original version of this book was shortened in 1968, [1] resulting in two different stories with the same title.
The Hardy Boys travel with Brigadier General Jack Smith to a historic Civil War battlefield in the Deep South. Rocky Run Battlefield (near the town of Centerville in an unnamed state) is the center of a legend involving a Confederate general who was disgraced due to his alleged involvement with the theft of gold from a bank. Smith seeks to vindicate the long-dead officer.