Searching the amusement park for a pony only Susan has seen, Susan and Kent track it to the Tunnel of Terror when they realize the pony is trapped inside.
Exercising ponies at the amusement park is a dream job, and Susan is thrilled to do it. But when she discovers an elegant bay pony off on its own, she knows she's got a mystery on her hands. The bay is so different from the stocky little Shetlands. Where did it come from?
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