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

Henry, Jessie, Violet, and Benny find themselves right in the middle of an Iowa cornfield and a brand new mystery! The children visit a farm that's famous for its wonderful corn maze.

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

When the Alden children join a group of volunteers to fix up an old house for senior citizens, they try to explain the puzzling behavior of their coworkers as well as investigate some unusual events.

Henry, Jessie, Violet, and Benny are getting the inside scoop on their favorite ice cream shop. The Aldens are helping out at the Greenfield Ice Cream Barn by putting up posters and creating new flavors. They even get to ride in the ice cream wagon pulled by Butterscotch the horse. However, ice cream is not the only thing being mixed up at the shop.

The Alden children are thrilled when a famous orchestra comes to their town to perform, and when an original Mozart score turns up missing, they solve the mystery of its disappearance.

While visiting the Florida Keys, the Aldens encounter suspicious characters, strange incidents at night, and a plot to steal valuable coral.

Henry, Jessie, Violet, and Benny are watching the clock and waiting to solve a mystery! The children are staying at the home of a famous inventor who was known for her one-of-a-kind clocks. The clocks are not the only things that make noise at midnight, someone, or something is making a mysterious tapping sound.

When the Alden children go camping on Blizzard Mountain, a place said to be inhabited by a ghost looking for buried treasure, they begin to think someone or something is trying to scare them off.

Henry, Jessie, Violet, and Benny are "on the air" and on the trail of a mystery, too! The children are helping out at a local station, where they're performing a play live on the radio, just like in the old days, but sometimes the radio station seems haunted.