"The Sportsman's Club in the Saddle" is part of Castlemon's series of books about a group of young friends who form a club dedicated to outdoor sports and adventure. In this particular installment, the focus is on horseback riding and the various adventures and challenges the characters face while riding.The story follows the members of the Sportsman's Club as they embark on horseback adventures, showcasing their skills and camaraderie. The novel highlights their experiences in the saddle, including their interactions with wildlife, encounters with rivals, and personal growth through their adventures.