"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!"

The Alden children start out on a one-day mountain climbing excursion that becomes very exciting. They unearth some mysteries and some treasure and have a good time in the process.

The Alden children are trapped in their cabin by a snowstorm, but while they wait for the storm to pass, they discover the cabin is full of secrets.

The Aldens, while testing the latest version of their favorite computer game, are surprised to find messages directed specifically at them.

When the Aldens come across a robbery at an antique store, they decide to use their detective skills to help locate the stolen ruby ring, bracelet, and necklace. Yet, before their investigation even begins, someone breaks into the Aldens' home and steals a box of Benny's favorite Silver Frosted Star cereal! Is there a hungry thief on the loose or is something else going on? The Boxcar Children have another mystery to solve.

While spending two days touring a zoo to see the baby animals, the four Alden children, aged six to fourteen, help catch an escaped monkey, participate in a photography contest, and investigate a missing camera.

The four Alden children, aged six to fourteen, uncover a mystery while volunteering at a food pantry for the needy.

When the Aldens go to the Pickering Natural History Museum to assist with the opening of a dinosaur exhibit, their work is hampered by a series of mysterious happenings.

The Alden children visit a family friend at his apple orchard which is rumored to be haunted, but instead of a ghost they find that some of the families' valuable antiques are being stolen.

The Alden children help out at the Greenfield Ice Cream Barn and while learning to make ice cream and create new flavors, they help solve a mystery before the Barn gets shut down.