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?
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