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

When Benny decides to dig a hole in the back yard, Grandfather gives him an old map that leads to a special discovery.

Benny decides to enter his dog Watch in the local pet parade, but Watch ruins his costume while saving a nest of baby birds from a cat.

The Aldens' boxcar is the perfect place for games, picnics, sleepovers, and fun. But is it also the perfect place for ghosts? When strange things start happening there, Benny is convinced that the boxcar is haunted. Will the Boxcar Children be able to scare away the ghost...or is it good-bye, to their boxcar?

When Benny's friend comes to visit the Alden house with his two-year-old brother Sam, the younger boy makes trouble everywhere he goes.