Four orphaned children make a home for themselves in an abandoned boxcar and are united with their grandfather

Benny anticipates making friends with the new kid down the street, but when he finds out that she's a girl, he is very disappointed

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.

While staying at an eighteenth-century inn in Vermont, the Boxcar children become curious about the mysterious "accidents" that keep plaguing the owners

A local radio station is holding the Great Detective Race, and the Boxcar Children have entered the contest! They solve riddles and search all over town for clues leading to the grand prize. But when some of the clues turn out to be fake, it's clear that someone is playing unfairly! Who could be trying to ruin the race - and why?

When the Aldens take up the case to investigate if a catastrophic oil spill that affected hundreds of species could have been prevented, they are led on an adventure to help other endangered animals around the world.

The boxcar children: Four orphaned siblings set up house in an abandoned boxcar because they think their grandfather is mean; but they realize he is nice and they move into his house and live happily ever after. Surprise Island: The Alden children spend living on their grandfather's island. The yellow house mystery: The Alden children determine to solve the mystery that surrounds an old yellow house on their grandfather's property. Strange things...