Duke in Danger

Christina used to have her own pony, Duke, but her parents sold him three years ago. The one day, at a horse sale, she sees a sad, scruffy grey, with a white star on his forehead. Can it be Duke? What's happened to him? Can she get him back? Allowed to keep Duke for good Christina and her friend Jody practise for the English Show. It all seems to be going well and then suddenly Duke is spooked at a jump. Is that it, all the hard work gone to waste? Will there be a happy ending?