The Alden children suspect that the other guests are somehow involved when things begin to disappear at the bed and breakfast where they are staying in Washington, D.C.

The Alden children uncover a plot to sabotage the Greenfield Bears baseball team. Includes baseball puzzles and activities.

The Boxcar children uncover a mystery when they compete in several contests at the county fair.

While sightseeing in Niagara Falls, the Boxcar children investigate a rash of souvenir store thefts.

While visiting Chicago with their grandfather, the Alden children begin receiving mysterious clues to a treasure hunt. Includes related puzzles, games, and activities.

The Aldens investigate a mystery involving a legendary mining expedition to the gold fields of Alaska.

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 children are enchanted by the wilderness and happy to meet another family with four children staying at the pond. But the Aldens soon encounter a strange set of coincidences and mishaps that threaten to spoil everyone's fun. When one night they see a rowboat moving across the water with no one in it, they begin to wonder: Is the pond haunted, as the townspeople claim? The Boxcar children are determined to discover who -- or what -- is trying to...

When the Aldens have the chance to work at a candy factory, they try to find out who is sabotaging the candy and why.

The Boxcar Children rush to investigate when it appears that someone is trying to rid the Ocean Adventure Park aquarium in Florida of its main attraction--a great white shark.