Hilary James (‘Mousie’) is just sixteen when Dancer, a seventeen hand, underfed, ill-mannered, pig-headed, chestnut stallion gallops into her life.

While dealing with the death of her beloved father, and being bullied at school, she and Dancer win the Fuller Trophy at the Royal Winter Fair. Her triumph is rewarded with an invitation to perform in England for Queen Elizabeth, but she has also attracted the unwanted attention of Samuel Owens who schemes to acquire Dancer for his niece, Sara. Rebuffed in his first attempt to buy the horse, Owens instructs his hired man, Chad Smith, to try to steal it. In England, Mousie has a dream in which a beautiful blonde horsewoman warns her of impending danger. Mousie bravely plunges into a puzzling mystery involving treachery and a handsome love interest.