Four orphaned children, afraid to go live with their grandfather, set up housekeeping in an abandoned boxcar and are doing fine until one of them becomes ill.

Summer vacation on an almost private island gives the Aldens a challenge. Henry, Jessie, Violet and Benny used to live alone in a boxcar. Now they have a home with their grandfather and are spending the summer on their own private island. There is a mysterious stranger on the island with a secret--but that's not the only surprise in store for the Boxcar Children.

The adventures of four orphans who encounter one mystery after another.

The Alden children have discovered a ghost in the old boxacar that once was their home.

A friendly writer with a metal detector, the mysterious inhabitants of a tower house, and the discovery of a locket in the sand are ingredients for the Aldens' latest mystery.

Grandpa Alden and the Alden children encounter danger, excitement, adventure, and mystery in a quiet island fishing village.

The Alden's neighbor, Lina wants the Alden children to help find a treasure hidden in her attic.

While canoeing and backpacking near Timberwolf Lake, the Aldens receive strange warnings to stay away from the area and stumble upon clues to a missing cache of stolen coins.

The Alden children hunt for their late grandmother's necklace that has been missing for years.

When the Boxcar Children provide backstage help for the re-opening of an old dusty theater, they learn that the theater is rumored to have ghosts, disappearing props, and even a haunted seat.