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Taking a shortcut through the Greenfield Cemetery, the Aldens stumble across a local superstition which maintains that visitors are required to leave gifts or suffer the wrath of a malevolent ghost, a suspicious tradition that prompts the children to expose the truth.

The Alden children suspect someone of trying to sabotage the local dog show.

The Aldens' boxcar is the perfect place for games, picnics, sleepovers, and fun, but when strange things start happening there, Benny is convinced that the boxcar is haunted.

While staying at a hotel in New York City, the Aldens investigate a series of annoying pranks plaguing the management and guests.

Someone is trying to put Aunt Jane's motel out of business, but the Alden children aren't going to let that happen.

The Alden children investigate various mix-ups at a zoo run by their grandfather's friend in an effort to save it not only from pranksters but also from the town council.

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.

When their grandfather buys a bookstore at auction in New Orleans, the Alden children help clean it up and discover that several people seem to be obsessed with the store and its contents.