Katy's life has never been busier. What with riding Jacko, keeping Trifle in shape and trying to tame her cheeky foal, Tinkerbell, Katy certainly has her hands full! New neighbour, James, is eager to help but doesn't always seem to save Katy much time! Things are just as hectic for her best friend, Alice, who has a brilliant and demanding show jumping pony. So when Katy hears about a new sport called horse agility, she wonders if it could help her solve all kinds of problems . . .