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. First 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! It seems there are a few people in Greenfield who don't want this yo-yo completed. The Boxcar Children will piece the evidence together to get to the bottom of this mystery.

When the Aldens help a friend of their grandfather's to build the world's largest yo-yo, they soon discover that more than one person is trying to prevent them from finishing the job--and for more than one reason.

Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery of an old lighthouse in this illustrated chapter book series beloved by generations of readers. The Aldens take a trip to the New England coast and get to stay in a lighthouse! But strange things happen after it gets dark—an unknown woman is seen walking around, and Watch wakes up growling late at night. Can the Boxcar Children shed light on a seaside mystery? What started as a single story about the Alden Children has delighted readers for generations and sold more than 80 million books worldwide. Featuring timeless adventures, mystery, and suspense, The Boxcar Children® series continues to inspire children to learn, question, imagine, and grow.

The Boxcar Children are on a trip to New Orleans to help Grandfather's friend with her bookstore. The children love exploring the city, and they find lots of interesting things in the store. But when a beautiful book disappears from the shelves, the Aldens have something even more interesting on their hands—a mystery!

Henry, Jessie, Violet, and Benny help out at a general store, but they soon find that another girl who works there is acting strangely. She seems nervous and doesn't answer questions about her past. What secret is the mystery girl hiding?

The Boxcar Children visit the old farmhouse where Grandfather and Aunt Jane grew up! But people in the nearby town seem to think something isn't quite right about the house. As the Boxcar Children investigate, they start to uncover secrets about the farm's past—dating all the way back to the Revolutionary War!

The Aldens visit their old friends, the Piccolos, at their pizzeria. When they learn the restaurant isn't doing well, they offer to help. But the oven doesn't work, the electricity shuts off, and then someone hands out fake coupons! Who wants to shut down Piccolos' Pizzeria?

The Aldens are on a Caribbean cruise. But when the ship's phone lines are disconnected and a false report of "man overboard" is made, the Boxcar Children suspect that someone is trying to cause a delay in the voyage. Who wants to steer them off course?

When Benny and Henry get summer jobs at a department store in town, they don't expect to be solving mysteries at work. But when an expensive vase disappears, the salespeople receive strange notes, and the jewelry display is tampered with, it's up to Benny to uncover the truth!

The Aldens are starring in The Wizard of Oz—and even Benny and Watch have roles! But as the children get ready to perform, mysterious things start to happen. Can the Boxcar Children find out what's going on and save the show before opening night?