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Publisher: Albert Whitman & Company
Published: Dec 1969
Genre: Children & Young Adults Fiction - Mysteries & Detective Stories
Retail Price: $7.99
Ages: 07 - 12 Pages: 124
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.