In the shade of the Giant's Throne Mountain, and on the coast of the Indian Ocean, Port St. Christopher is home to Apley Towers; a riding school for girls and boys, young or old, who learn what it means to be a true horse rider. When a mysterious new rider arrives at Apley, Kaela and Trixie are immediately on the defensive. Not only is she dangerously talented, she insists on wearing expensive sunglasses whilst she rides. Who is this Sunglasses-Girl...