90 Day Wondering 1956

With rodeo champions mysteriously dying just before important competitions, government agent Carmen Serano (Rita Hayworth) joins a gang of racketeers in hopes of uncovering the killers. She gets help from singing rodeo star Tex Masters (Tex Ritter), along with his harmonica-playing sidekick Lucky (Horace Murphy), who is looking for the gang that killed his brother. In the process they foil a bank robbery and stop a runaway carriage filled with dynamite.