The Giant Yo Yo Mystery

By Gertrude Chandler Warner, Robert Papp

Subjects: Mystery and detective stories, World records, Brothers and sisters, fiction, Yo-yos, Orphans, fiction, series:BoxcarChildren, Fiction, Children's fiction, Orphans, Brothers and sisters, Juvenile fiction, collectionID:Boxcar4

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!