Nurse Redheart has been shunted off to a small-town hospital for being too nosy, and generally questioning the doctor's orders. In this new town, she gets to finally experience the yearly festival, where ponies from all over come to engage in activities of all kinds.
Spitfire and Soarin have come to take part and show off their latest luge, but when an accident happens it unearths a secret best left hidden and long sought by those crazy enough to want to bring it out. Redheart has to find a way to save everypony from this new threat, but will she avoid it herself?