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?