Henry, Jessie, Violet, and Benny are excited to learn more about raptors when they volunteer at a rehab center for wild birds, but not long after they arrive, a series of strange events makes it seem like someone might be trying to sabotage the center.

In the year before they become the orphans known as the Boxcar children, Henry, Jessie, Violet, and Benny Alden live with their parents at Fair Meadow Farm, where, although times are hard, they take in a family who has been stranded in their car during a blizzard.

While exploring the caves around Dragon's Mouth Cavern, a series of unusual and somewhat frightening events convinces the Alden children that someone does not want them around.

Four orphans take shelter in an old, red boxcar during a storm, and, determined to make it on their own, they turn it into a safe, cozy home.

The Boxcar Children know how much work it takes to live in the wilderness. They also know how much fun it can be! The children love exploring and learning new things at a primitive skills summer camp. But when strange things start happening around the camp, they need to use another of their favorite skills--mystery solving!

Grandpa Alden's sister, Jane, is not feeling very well, and it's the Alden girls who go to care for her. Soon a mystery begins to unfold and the clues are everywhere; from the stranger on the train, to the beautiful yellow rocks on Aunt Jane's ranch. When Henry and Benny come out to join the girls, the four children find themselves unravelling the intriguing mystery.

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

The Aldens discover that one of Pikesville's little league coaches has been cheating all season, which is somehow related to a plan to raze the town's historic baseball field.

When their grandfather buys a bookstore at auction in New Orleans, the Alden children help clean it up and discover that several people seem to be obsessed with the store and its contents.