A valuable show horse, transported from France, arrives at Pine Hollow, the horse's mysterious owner to arrive later. Amidst all the excitement, Carol begins to believe that her friends in The Saddle Club have forgotten her birthday. When the champion event horse (Hugo) escapes, Carol, Stevie & Lisa take it upon themselves to help find him. The girls find Hugo, unveil their surprise birthday party for Carol, and learn that the horse's owner is none other than French dressage champion Dorothée Doutey.