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

The Alden children hunt for their late grandmother's necklace that has been missing for years.

While on a cruise with their grandfather, the Alden children help discover who is behind the mysterious troubles of the ship--disconnected phone lines, engine trouble, a man overboard--and still have fun sightseeing, eating, and swimming.

Two brothers take summer jobs at a department store where a series of peculiar events brings them under suspicion.

The Alden children plan to ride in their boxcar at the Greenfield Founders' Day Parade, but the newly refurbished boxcar is stolen a couple of days before the big event.

While helping fix up the old house their cousins have bought, the Aldens hear stories about its being haunted and find evidence suggesting that there may be a ghost there.