The Saddle Club girls are participating in a new kind of horseback activity – endurance riding. They’ll have to condition their horses and themselves for the grueling contest if they plan to make it across the finish line. But an annoying rider named Chloe keeps getting in the way. Carole Hanson, Stevie Lake and Lisa Atwood are pretty sure they can finish the competition. The question is: can they endure Chloe?