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В The Aldens are helping a local carpenter build a giant yo-yo! The yo-yo could break the world record, and if it does, it will put Greenfield on the map. But when plans are stolen and the yo-yo is damaged, it's clear someone doesn't want this yo-yo to be built. Can the Boxcar Children save the day before the world record is lost? 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!