At an old library, the Alden children discover a boy who needs their help and a stranger who is after a valuable object they found in the library.

"The Alden children help solve a case surrounding missing vegetables and vandalism in the community garden"--

The pumpkin head mystery: Every fall at the Beckett farm, visitors come to buy pumpkins and go on hayrides. Best of all, Henry, Jessie, Violet, and Benny get to dress up in costumes and help with the fun. But something is haunting the farm! The cupcake caper : People line up around the block to buy Mama Tova's cupcakes. But who could be trying to steal her secret recipe? The clue in the recycling bin : The Aldens are volunteering at the local recycling...

The mystery of the star ruby: The Aldens take part in a hunt at a gem mine and discover that someone is out to sabotage the contest. The pizza mystery: 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. The radio mystery: The Alden children are helping out at a radio station, and they're going to be actors in a live mystery show....

Schoolhouse mystery : The Boxcar Children are spending the summer in a tiny, quiet New England fishing village, and the Alden's are teaching! Caboose mystery : When the Alden's spend the summer riding on a train, they get to live in a train car once again and this time, they're staying in caboose No. 777. Houseboat mystery : The Alden's are spending the summer traveling on a houseboat, but someone is watching them and wants something on the boat.

"The old abandoned school in Silver City is being fixed up as an art center and the Boxcar Children volunteer to help clean up the place. But the other volunteers are scared by the spooky goings-on in the school--doors lock by themselves, and chalkboard messages appear out of nowhere! Will the Aldens find out the secret of the haunted school?"--