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 Henryās Misty of Chincoteague.
Thereās a sick horse at Misty Inn! Something Buttercup is eatingāor being fedāis making her ill. Can Willa and Ben solve this pony problem and help Buttercup feel healthy again?