"Carolina Aguasvivas's oldest friend, Vida Jones Castillo, has never been interested in riding horses -- until now! Carolina is thrilled for her BFF to join Paradise Ranch, along with new sponsorship student Brielle Stuart. But the girls' perfect summer falls apart when they find out that one of the horses might be sold -- Carolina's favorite riding buddy, Shadow. Can Carolina and her friends save her beloved horse...and the future of the Unbridled Dreams program?"-- Provided by publisher.