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. It seems there are a few people in Greenfield who don't want this yo-yo completed. Illustrations.

The Giant Yo-Yo Mystery 2014, Oasis Audio

ISBN-13: 9781613754337

Audiobook CD

The Giant Yo-Yo Mystery 2006, Albert Whitman & Company

ISBN-13: 9780807508794

Trade paperback

The Giant Yo-Yo Mystery 2006, Perfection Learning

ISBN-13: 9780756975104