A horse called Brilliant is the only one who knows the location of a gold mine. When Brilliant's owner is killed, the trio known as the Three Mesquiteers (Bob Steele, Tom Tyler and Jimmie Dodd) are mistakenly arrested for the murder.

Bob Steele
as Tucson Smith

Tom Tyler
as Stony Brooke

Jimmie Dodd
as Lullaby Joslin

Helen Deverell
as Ann Martin

George J. Lewis
as Freddy

Walter Soderling
as Martin

Charles Miller
as Frank Nolan

Kermit Maynard
as Henchman Reese

Pierce Lyden
as Henchman Rankin

Carl Mathews
as Henchman Lon