⁣A young man returns to Diablo to practice medicine after his father put him through medical school.

⁣When a bank president is murdered, the townspeople accuse the man's future son-in-law of the crime and a lynching party is formed. Cisco and Pancho must find out who the real killers are before the mob hangs the innocent man.

⁣Sue Farnum inherits a circus, but her dead father's partner is trying to take it away from her. Roy and Bob Nolan are filming a movie on location at the circus. They and a number of other western movie stars come to Sue's aid, putting on a show and catching the bad guys.