- Author: Carolyn Keene
- Binding: PB
A new petting zoo has opened in River Heights. Nancy and her friends can't wait to check it out. Unfortunately, a pony named Buttons keeps escaping from his pen. He's getting pretty famous for eating everyone's flowers. As much as Nancy secretly wishes Buttons would turn up on her lawn, she knows it's important to make sure he stays put. The only trouble is, no one knows how he's getting out. Sounds like it's time for the Clue Crew to saddle up and settle this pony problem!