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The Aldens stumble upon a new mystery to investigate when they discover that the fruits and vegetables they are helping grow in a local restaurant's garden are disappearing.

The Aldens are thrilled to be helping out at Cogwheel Stadium as the Clayton Cogs try to win the pennant, but when the children realize someone has stolen the team's pitching signals and given them to the other team, they set out to find the spy before he ruins the team's chance at victory.

The Alden kids are sabotaged when they compete in a new game show that involves a camera crew following them around Philadelphia as they compete with another brother-sister team in a search for clues.

Henry, Jessie, Violet, and Benny are given the opportunity to be extras in a movie about the Alamo, but they are called upon to use their sleuthing skills when Claire, the star of the film, is implicated in the theft of a valuable ring.

Henry, Jessie, Violet, and Benny, attending an astronomy conference with their grandfather at Mountvale College, become involved in a mystery when a student who is slated to make a presentation about an outer space discovery learns that his research paper has been stolen.

The Aldens visit Grandfather's friend, Abby, at the Ogopogo Retreat, and attempt to help the woman get more business for her resort, even though something is trying to stop them.

The Aldens investigate when the arrival of several suspicious characters in Greenfield coincides with a mystery involving a popular boy actor.

When the Aldens help a friend of their grandfather's to build the world's largest yo-yo, they soon discover that more than one person is trying to prevent them from finishing the job--and for more than one reason.

The Alden children investigate when it appears that someone is trying to sabotage their friend professional hockey player Kevin Reynolds's plans to build an ice skating rink in Greenfield.

After the Aldens arrive for the opening of the new game store, someone robs the coffee shop at the end of the mall.

The Alden kids investigate a series of break-ins and vandalization at the local recycling center, where Mrs.

The Aldens go with their grandfather to his class reunion and investigate if a buried Civil War treasure is at Goldwin University.

"In the town of Sleepy Hollow, the Aldens discover an old legend that's come back to life! Their friend's ghost-tour business is being disrupted by a spooky figure on horseback who throws pumpkins in the streets and frightens everyone.

"During auditions for the show 'Pop Star Sensation' at the local mall, one of the judges, a famous pop star, disappears, and the Aldens must find out where she went"--.

The Aldens visit Ireland and stay in a beautiful castle that's now a hotel! But the caretaker seems very superstitious, and at night they see a mysterious figure who walks the halls carrying a lantern.