Title: The Giant Yo Yo Mystery
First published: June 30, 2006
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!
Subjects: Brothers and sisters, World records, Juvenile fiction, Fiction, Yo-yos, Orphans, Mystery and detective stories, Children's fiction, Brothers and sisters, fiction, Orphans, fiction, series:BoxcarChildren, collectionID:Boxcar4