The Riding Club Crime
Carolyn Keene
 Nancy, George and Elsa are enjoying a horse ride, when Nancy's horse falls into a hole while attempting a jump over a post-and-rail, four-foot jump. Elsa is a counselor at Green Spring Pony Club summer camp. The camp has been vandalised by unknown persons. The owner, Mrs Rogers, is getting worried. Nancy, disguised as a counselor, tries to figure out who the culprit is. As more incidents happen, the more Nancy realizes she has to work quickly. Will Nancy and her friends be able to keep the Green Spring Farm going?