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 Boxcar Children decide to investigate when it begins to appear that the Blackwells, new neighbors who have decorated their front gate with spiders, have something to hide.
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 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.
While staying at an eighteenth-century inn in Vermont, the Boxcar children become curious about the mysterious "accidents" that keep plaguing the owners.