The four Alden children, aged six to fourteen, volunteer at the new recycling center in town, and help uncover who is breaking in and making a mess each night.
The Alden kids are sabotaged when they compete in a new game show that involves a camera crew following them around Philadelphia as they compete with another brother-sister team in a search for clues.
When the Aldens agree to watch the house of a local author who has written a book about a vampire, they end up investigating activities that are suspiciously similar to those in his book.
A talented young soccer player in Greenfield is given the honor of being a child mascot at an international soccer tournament in Brazil, but when an anonymous letter insists that she doesn't deserve to go, the Aldens investigate.
While staying at an eighteenth-century inn in Vermont, the Boxcar children become curious about the mysterious " accidents" that keep plaguing the owners.
