When the Alden children accompany their grandfather to the Snow Haven Lodge, a series of odd occurrences threaten to disrupt the annual winter games.

When the Alden children join a group of volunteers to fix up an old house for senior citizens, they try to explain the puzzling behavior of their coworkers as well as investigate some unusual events.

The Aldens set out to prove the innocence of their old friend Mike who has been accused of starting a fire.

At an old library, the Alden children discover a boy who needs their help and a stranger who is after a valuable object they found in the library.

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.

While helping run Jerry Taylor's general store, the Alden children investigate his mysterious employee Nancy.

While staying at the Crooked House, the family home of their housekeeper Mrs. McGregor, the Aldens try to solve a riddle that will lead them to a hidden treasure.

Taking a shortcut through the Greenfield Cemetery, the Aldens stumble across a local superstition which maintains that visitors are required to leave gifts or suffer the wrath of a malevolent ghost, a suspicious tradition that prompts the children to expose the truth.