Emily is hosting a pony-themed sleepover - complete with a real, live pony! Em is excited since she loves horses and knows a ton about them. But her friends don't seem to be taking things as seriously as she is, and Em is worried. When the pony finally arrives, the girls take turns learning how to ride her. But it looks like Em is having the most trouble - which isn't fair because she knows the most about ponies! Will Emily be able to enjoy the party when it looks like her friends are better around horses than she is? Or will this pony party be a pony disaster?