A family moves into the house next door! The Boxcar Children decide to make friends with their new neighbors by building a tree house with them. In the process, they notice a window in their neighbor's house that nobody knows about. Does the old home have a secret?
A sudden snowstorm traps the Aldens in a mountain cabin! The cabin is cozy, but the children hear strange noises at night and find a coded message carved into the closet door. Can the children crack the code and solve their snowbound mystery?
Floating down a lazy river, Benny finds a blackmail scheme in progress.
A trip in a caboose at the end of a freight train leads to an old clown and a search.
The Aldens' friend Max says nothing interesting happens in Port Elizabeth. But when the children visit the small fishing village and come across a man snooping around the local library, they prove that every town has its mysteries.
Relates the adventures of the Alden family as they climb Old Flat Top Mountain.
Renting a lighthouse is unusual, but even more so is an unfriendly boy's peculiar behavior.