The Giant Yo Yo Mystery
by Gertrude Chandler Warner , Robert Papp
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First published: 2006
1 language
ISBN: 9780756975104
Description
The Aldens are helping one of Grandfather's friends break a world record by building the world's largest yo-yo! But 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!
