The Boxcar Children visit their cousin Joe and his wife Alice, who live in Pine Grove near an amusement park. The children fall in love with the beautiful antique horses of the merry-go-round, but when they later discover some of the horses damaged, they begin to suspect something funny is going on.

The Aldens visit their cousins Joe and Alice, who live near an amusement park The park has games, cotton candy, and a beautiful old carousel with wooden horses. But then Benny notices one horse isn't working and his favorite dapple gray has been damaged. Why would someone sabotage the carousel?