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.

Directed by: Charles Barton
Written by: Ethel Doherty & Edward E. Paramore Jr.
Runtime: 63 minutes
Tagline: Lone protector of a terror-stricken family marked for death by an unseen, unknown peril...the mysterious Black Rider!
Cast:
Randolph Scott Randolph Scott
Larry Sutton 
Charles 'Chic' Sale Charles 'Chic' Sale
Tex Murdock 
Mrs. Leslie Carter Mrs. Leslie Carter
Mrs. Borg 
George F. Marion George F. Marion
Jim Ballard 
Ann Sheridan Ann Sheridan
Rita Ballard 
Florence Roberts Florence Roberts
Mrs. Ballard