Jack Logan is the heir to half of a map to a hidden Indian mine. The trader and villain Jean Gregg sends his chief henchman Mack to make life difficult for Jack. Jack is aided in his quest by the heirs to the other half of the map: Helen Holt and her younger brother Billy, and by a uniformed mystery man known as "The Mystery Trooper".
| Actor | Role |
|---|---|
 Robert FrazerJack Logan | Jack Logan |
 Blanche MehaffeyHelen Holt | Helen Holt |
 Buzz BartonBilly Holt | Billy Holt |
 Al FergusonJean Gregg | Jean Gregg |
 Charles KingMack | Mack |
 William BertramChief Red Eagle | Chief Red Eagle |