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Henry, Jessie, Violet, and Benny, attending an astronomy conference with their grandfather at Mountvale College, become involved in a mystery when a student who is slated to make a presentation about an outer space discovery learns that his research paper has been stolen.

The Aldens investigate when the arrival of several suspicious characters in Greenfield coincides with a mystery involving a popular boy actor.

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.

An adaptation of Gertrude Chandler Warner's story about the Alden children--Henry, Jesse, Violet, and Benny--who go on a summer trip to visit Aunt Jane and help their friend Mike find out who started the fire that burned down his house.

Henry, Jessie, Violet, and Benny begin to dig into the past of the old boxcar turned playhouse in their back yard and discover clues about why it is being haunted.

After the Aldens arrive for the opening of the new game store, someone robs the coffee shop at the end of the mall.

The Aldens discover that one of Pikesville's little league coaches has been cheating all season, which is somehow related to a plan to raze the town's historic baseball field.

The Alden kids investigate a series of break-ins and vandalization at the local recycling center, where Mrs.

The Aldens go with their grandfather to his class reunion and investigate if a buried Civil War treasure is at Goldwin University.

A collection of three mysteries in which the Boxcar Children face snow, ice, and cold as they set out on their latest adventures, including finding out who is trying to ruin the fun at a winter carnival, discovering a secret in the snowy wilderness, and solving puzzles at an old-fashioned New England inn.

The Alden children go to spend the summer on their aunt's ranch out west where they set themselves the task of restoring the relationship between Aunt Jane and their grandfather.

Henry, Jessie, Benny, and Violet Alden, spending the summer out west, decide to investigate when their friend Mike's house burns down and he is blamed for starting the fire.

"The Boxcar Children are helping a friend find out more about their family's history.

"The Aldens have been invited to a secret spy competition put on by their favorite author.

"On a train tour of the Southwest, someone is bringing the lawless days of the Old West to life! Can you help the Aldens figure out who is behind the trouble? In this interactive, choose-your-path mystery, readers will help the Boxcar Children make decisions that will either solve the mystery or lead to the end of the line"--Provided by publisher.