The Aldens investigate when the new coach of their community basketball league has her Most Valuable Player trophy stolen.

When the Aldens visit Yellowstone they discover a map showing the way to an old cabin where gold is supposedly hidden, but they encounter lots of interference in their attempts to hike the trail.

The Alden children save an old woman's house, land, and all the animals in her animal shelter from greedy contractors.

While visiting Chicago with their grandfather, the Alden children begin receiving mysterious clues to a treasure hunt. Includes related puzzles, games, and activities.

When Grandfather's friend Seymour Curtis invites the Alden family to spend some time at his apple orchard, Benny is determined to find the ghost rumored to haunt the premises. Yet, it seems as if the Aldens may have a more earthly crime on their hands.

When the Alden children and their grandfather visit Everglades National Park in Florida to solve the mystery of a missing ranger, they discover that a panther provides a clue.

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.

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.

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 Boxcar Helpers baby-sit, wash cars, mow lawns, and care for pets to raise money for Greenfield hospital. But Beth keeps disappearing and other things start to go wrong. Is someone trying to put them out of business?