The Pumpkin Ghost (Princess Ponies, Bk. 10)

It's Halloween, and Pippa can't wait to go trick-or-treating in her amazing zombie pony costume. But before the festivities get underway, Cloud appears to tell Pippa that the ponies of Chevalia need her help once again - because a mysterious pony ghost is haunting Stableside Castle! Though she's just as scared as the others, Pippa joins forces with her best friend, Princess Stardust, to figure out if the fabled ghost is real . . . or if someone is up to a little bit of Halloween mischief! Can they be brave and get to the bottom of this spooky mystery?