Publisher's Synopsis
The Dunlap siblings must solve the mystery of a sick pony on Chincoteague Island in this second book of a chapter book series inspired by Marguerite Henry's "Misty of Chincoteague."
There's a sick horse at Misty Inn! Something Buttercup is eating--or being fed--is making her ill. Can Willa and Ben solve this pony problem and help Buttercup feel healthy again?
