Phil Marsten, Stevie's boyfriend and an out-of-town member of The Saddle Club, is boarding an Arab mare at his family's stable. When Phil offers to let Stevie ride the horse, she eagerly accepts. In exchange, Stevie has promised to give the horse all the care and exercise she needs. As Stevie begins working with the horse and preparing her for a forthcoming dressage exhibition, she quickly comes to love and respect her beautiful new mount. But the mare also has a mysterious allergy that won't go away. Can Stevie find the cause, and live up to her side of the bargain to take the very best care of the horse?