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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.

While visiting their cousin's pineapple plantation in Hawaii, the Aldens hear a local legend about a black pearl with a curse on it and investigate mysterious incidents on and around the plantation.

The Alden children help out a storeowner at the Hope Harbor Mall and discover that someone is tampering with the merchandise shipments.

The Alden children agree to help their neighbor search for treasure she believes is hidden in her attic, but the quest becomes urgent when they realize that someone else is trying to find it first.

While visiting an old mansion, the Aldens investigate the possibility that it may be haunted.

Henry, Jessie, Violet, and Benny begin to dig into the past of the old boxcar turned playhouse in their back yard and discover clues about why it is being haunted.

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.

Henry, Jessie, Violet, and Benny decide to investigate when they travel with their grandfather to buy honey at the Sherman's honey farm only to discover that the bees, for some reason, have quit making honey.

The Aldens visit an old camp in Quebec, Canada, and begin to suspect that someone or something is trying to scare them away from the place.

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 children visit an old Kansas inn that is full of secrets, such as why did a famous photographer visit the innto take a single picture, who was the legendary guest who came west on an orphan train.

The Aldens discover that one of Pikesville's little league coaches has been cheating all season, which is somehow related to a plan to raze the town's historic baseball field.

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.

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.