The Aldens participate in a three-day bicycle ride and soon find that someone seems to be intent on keeping others from completing the event

The Boxcar children become involved in a mystery going back to Revolutionary War days.

The Aldens are spending a week at Camp Seagull on beautiful Claw Island. But as soon as camp begins, they realize that someone is not playing fair. Everything begins to go wrong for the Aldens they lose their luggage, Henry misplaces the camp flag, and the campers on the other team use one of Jessies ideas to score points for themselves. Are some campers so desperate to win the Olympics that they are willing to cheat? The Boxcar Children are...

Relates the exploits of the four Alden children as they locate a missing man. "Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather and are determined to solve the mystery that surrounds an old yellow house on his property. Strange things have happened in that house where long ago a man disappeared. When the Boxcar Children explore the house, they find an old letter written by the brother of...

The Aldens, while testing the latest version of their favorite computer game, are surprised to find messages directed specifically at them

The Aldens try to help a visiting Russian gymnast who is surrounded by mysterious people and events and who seems to have a secret

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

The Aldens visit Grandfather's friend at the Ogopogo Retreat and aided by puzzling clues, embark on a treasure hunt to prevent the retreat from being sold

The Alden children visit a family friend at his apple orchard which is rumored to be haunted, but instead of a ghost they find that some of the families' valuable antiques are being stolen

The Alden children help out a storeowner at the Hope Harbor Mall and discover that someone is tampering with the merchandise shipments