The Boxcar Children visit the old farmhouse where Grandfather and Aunt Jane grew up! But people in the nearby town seem to think something isn't quite right about the house. As the Boxcar Children investigate, they start to uncover secrets about the farm's past—dating all the way back to the Revolutionary War!

The Alden children visit Mystery Ranch, a man in a blue hat appears, Mike's house burns down, and the uranium mine is in danger.

Two brothers take summer jobs at a department store where a series of peculiar events brings them under suspicion.

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.

Henry, Jessie, Violet, and Benny become trapped in a cabin by an unexpected snowstorm, which turns into an even greater adventure when they help their neighbors, a baker and his family, recover an old family secret.

The Alden children travel on a Mississippi paddle-wheel steamer to visit an old family friend in his cabin near Hannibal, Missouri, and try to discover who is responsible for the mysterious activities near the house.

The Bailey School Kids need to do a report on England. Howie picks Camelot as his topic, which is how he knows the new assistant at the library, Mr. Merle, looks just like the ancient wizard Merlin! The kids discover a crystal ball in Mr. Merle's office and learn that he has a huge goldfish named Arthur, just like the ancient king. Then Mr. Merle transforms the library into a medieval castle and starts mesmerizing kids with the magic of reading! Something...

The Alden children discover another mystery when the agree to help injured Mr. Yee tend to his plot in the community garden and find out that vegetables are going missing and plots are being vandalized.

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.

While helping their grandfather prepare for Greenfield's Winter Festival, the Alden children uncover a mystery surrounding the statue in the town square.