A runaway orphan, young Sonora, persists in a menial job mucking stables in Doc Carver's travelling stunt show. Her great wish is to become a death-defying 'diving girl,' but Doc refuses her pleas. Undaunted, Sonora's gutsy resolve finally convinces him to give her a break. On the brink of stardom, however, a cruel twist of fate threatens to destroy her dream.