Four orphaned siblings take refuge in an abandoned boxcar that becomes their home, as they hide from their "villainous" grandfather.

When the Alden children go camping on Blizzard Mountain, a place said to be inhabited by a ghost looking for buried treasure, they begin to think someone or something is trying to scare them off.

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

"The Aldens are spending spring break on a beach, but they aren't just soaking up the sun. They're protecting an endangered species! Their job is to mark sea turtle nests so the eggs can be moved to a safe place to hatch, but someone is digging up the eggs without permission. Can the Boxcar Children figure out what's going on and help save the sea turtles?" --

People line up around the block to buy Mama Tova's cupcakes. But who could be trying to steal her secret recipe? The Boxcar Children follow clues to a cupcake contest, where they must use their mystery-solving skills to find a thief.

"The Aldens find a hidden time capsule! Inside is a journal with clues to a treasure hunt. Who wrote the journal? And after a hundred years, can the Boxcar Children find the treasure?"--Back cover.

The Aldens investigate when a new store called the Game Spot opens in town and the neighboring shops are robbed.

The Alden children suspect someone of trying to sabotage the local dog show.

The Boxcar children investigate the disappearance of a student's research paper from an observatory, and the subsequent disappearance of another student.

While sightseeing at the Alamo, the Boxcar children investigate the disappearance of a priceless ring from the Alamo museum.