About this book
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 sistersWorld recordsJuvenile fictionFictionYo-yosOrphansMystery and detective storiesChildren's fictionBrothers and sisters, fictionOrphans, fictionseries:BoxcarChildrencollectionID:Boxcar4