"Henry, Jessie, Violet, and Benny used to live in a boxcar. Now they have adventures everywhere they go. At a lighthouse, the children find a mystery in the night!"

Henry, Jessie, Violet and Benny Alden discover that a mystery surrounds the run-down yellow house on Surprise Island. The children find a letter and other clues that could lead them on the trail of a man who vanished from the house.

When the Alden children climb to the top of Old Flat Top Mountain, they encounter a mysterious mountain cave, a perilous rockslide, and a secret treasure.

When their favorite pizza restaurant almost goes out of business, the Alden children try to help their friends stay open while they find out who is behind all their problems.

A hip new doughnut shop known for its bizarre recipes is opening up in Greenfield. At first, the owners of the other doughnut shop in town, Delilahs, arent worried. But when the new shop starts making doughnuts that look just like some of Delilahs greatest hits, the Boxcar Children must figure out if its just a coincidence or if someone from the new shop is stealing Delilahs recipes.

When their grandfather arranges for them to spend two week at Sunny Oaks, the four Alden children enjoy settling into the routines of farm life but become suspicious about a mysterious horse locked in the stables.

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. "The Raptor Rehab Center's reputation is at stake! Can the Aldens figure out who's responsible for the bad press before the center gets shut down for good? Henry, Jessie, Violet, and Benny are...

The Aldens become involved in a community theater production of "The Wizard of Oz," which is systematically and mysteriously being sabotaged.