When the Campbell family move to the country, eleven-year-old Jane spends all her spare time watching the horses in the paddock next door. Realising they need to do something about her obsession, her parents sign her up for riding lessons. When they see that Jane has a flair for riding, her parents decide she should have a horse of her own - Tammy. With her new friends at the local pony club, Jane has many adventures, some of them dangerous and exciting.