A mining engineer teams up with a crusty deputy sheriff to solve the mystery killings at an old mine where the owner's family waits for him to die, and where a valuable radium strike may have been made.
| Actor | Role |
|---|---|
 Randolph ScottLarry Sutton | Larry Sutton |
 Charles 'Chic' SaleTex Murdock | Tex Murdock |
 Mrs. Leslie CarterMrs. Borg | Mrs. Borg |
 George F. MarionJim Ballard | Jim Ballard |
 Ann SheridanRita Ballard | Rita Ballard |
 Florence RobertsMrs. Ballard | Mrs. Ballard |
 Kathleen BurkeFlora Ballard | Flora Ballard |
 Willie FungLing Yat | Ling Yat |
| JJames EaglesJohn Borg | John Borg |
 Howard WilsonFritz Ballard | Fritz Ballard |