A trio of U.S. marshals battle a crooked banker behind a diamond smuggling ring. Ken Maynard, Hoot Gibson, Bob Steele, Myrna Dell, Ian Keith, Donald Stewart, Charles King., A trio of cowboy heroes, the “Trail Blazers,” use their wits and their guns to stop a ring of diamond smugglers., Hoot Gibson and the Trailblazers take jobs as telephone linemen to get the goods on a local banker who is the chief of a band of counterfeiters., Ken Maynard and Bob Steele star in this western as US Marshals who stop a robbery, but little do they know they’ve stumbled upon a diamond heist!