"Fly-by-Night" was not the best choice for an eleven-year-old girl who had never ridden before; but as soon as Ruth Hollis saw the sturdy, lively pony, she knew that he was the one she wanted. All her life Ruth had longed to own a pony and now that her family had moved from London to a new housing estate in East Anglia, she had persuaded her father to let her spend her savings on a pony. But having taken possession of Fly-by-Night, Ruth found that her troubles had only just begun.