Plot
In 1932 Sonora Webster lives with her sister, Arnette, and abusive Aunt Helen during the Great Depression. Sonora admires a magazine clipping of a beautiful girl in Atlantic City. Aspiring to be like her she cuts off her waist length hair causing her Aunt to make her wear a bag on her head. After a series of troubles, which involve her accidentally letting the cows loose, punching another girl for making fun of her (she was the one who instigated the accident that let the cows out), and getting suspended from school, Aunt Helen sells her treasured horse, Lightning. Helen then tells Sonora that she will be sent to an orphanage the following day. Instead, having found an ad in a newspaper earlier that day for a diving horse girl, Sonora slips out of the house during the night to follow her dreams. She travels to the county fair and sees a performance by Marie, a diving girl who rides a horse off a platform, and aspires to do so too. Marie's employer, Doc Carver, tells her she is too young but gives her a job as a stable hand due to her ability with horses, and she begins traveling with them. Doc's son, Al, wins a wild horse in a card game and Sonora names him Lightning. She later surprises Doc by taming and riding him, so he promises to train her to be a diving girl if she can mount it while it's moving, which she succeeds after multiple attempts. This causes a huge fight between Al and Dr. Carver as Al says he pushed her too hard. Al leaves and promises to write Sonora.
Marie while watching Sonora ride gets on to show her how to properly do so. Sonora warns Marie not to kick him, but she ignores her and Lightning rears causing her to fall off and dislocate her shoulder. With her unable to perform, Dr. Carver asks Sonora to step in and make her first dive. Although she has never dove with Lightning, their first jump is successful. Marie becomes jealous, and as Doc tires of her diva-like behavior, she quits rather than share billing with Sonora. During the months that follow Al writes to Sonora as she continues to make successful dives on lightning but Doc hides all his letters and she thinks that he has forgotten about her. When Doc and the new stable hand, Clifford, are away from the farm in search of jobs for the show, Lightning falls ill with colic. Al returns, and he and Sonora work together and Lightning pulls through. Doc hasn't found any places for them to perform at, but then Al announces he has arranged a six-month contract to do so at the Steel Pier in Atlantic City, New Jersey as he knew this was always Sonora’s dream. This reconciles Doc and Al, but then the former passes away of a heart attack on the way to Atlantic City, and Al assumes Doc's role as the show presenter. Sonora searches for Doc's jacket to give Al confidence on his first show, and finds one of his letters in it that confesses his love for her, and she lets him know that she feels the same.
Al proposes to Sonora just before a performance in front of their biggest crowd, which she accepts. As Lightning is still recovering from colic Sonora is forced to make the dive on Red Lips Marie’s former mount The horse is jittery unlike Lightning who has become a steady performer, and he falters and trips off the end of the diving board after shying from cymbals crashing below. Not expecting it, Sonora has her eyes open as they land in the pool. Both are alive, but Sonora has issues with her vision but it quickly clears. However, she hides this from Al, not wanting him to stop her from doing the shows. She wakes the next morning to discover she is permanently blind from detached retinas in both eyes. She has to learn to find her way around, and Al is always by her side to help her. To avoid a breach of contract lawsuit, he must find another diving girl within a week, so he calls Marie, who returns. Meanwhile, Sonora misses diving terribly, especially as she has to stay home while she knows Al and Marie are out performing. She tells Al of her desire to dive with Lightning again, and they work together to try to train her to mount him blind, but it proves fruitless and Al gives up.
The next day, Clifford locks Marie in her dressing room, and Sonora performs in her place with Lightning. Al shouts at her to come back down, but she continues and the jump is successful. Her voiceover tells you that she continued diving for eleven more years with the audience never learning of her blindness, and of her happy marriage to Al.
