Frankie's dream is more like a nightmare when her new horse turns out to be Zen – a shaggy, disobedient clown of a pony, who will totally wreck her chances of fitting in at Pony Club in her new town. Zen is everything Frankie doesn't want – until the magnetic horse whisperer Shannon shows her just what Zen could be if ridden freely. Natural horsemanship opens up a whole new way of riding and a whole new world of connection between Zen and Frankie. But Frankie's dad is getting more depressed after her parents' divorce, star rider and star mean girl Violet has it in for Frankie, and her best friend Kai is keeping a secret. Then Shannon announces she's closing down her riding centre. Frankie's got an idea that could save it ... but can she and Zen rise to the challenge?