Description
When the Aldens help a friend of their grandfather's to build the world's largest yo-yo, they soon discover that more than one person is trying to prevent them from finishing the job--and for more than one reason.
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The Aldens are helping one of Grandfather's friends break a world record by building the world's largest yo-yo! As they help with the project, strange things begin to happen. First someone follows them, and then the plans for the yo-yo turn up missing. Someone is trying to sabotage the yo-yo before it's launched! It seems there are a few people in Greenfield who don't want this yo-yo completed. The Boxcar Children will piece the evidence together to get to the bottom of this mystery.
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