When a fatal equine virus breaks out at a nearby stable, The Saddle Club has to endure forty-five days of waiting and worrying about whether the disease will reach Pine Hollow. Then Carole realizes that one of her favorite horses may already be infected, and she decides to take matters into her own hands and hide the horse. Can Carole protect Pine Hollow? Or will she discover that there is nothing she can do to keep her worst nightmare from becoming reality?