boxcar children (fictional characters)

The Alden children find an unusual mystery when they spend a vacation on a supposedly deserted South Seas Island.

When the Alden children accompany their grandfather on a trip to Seattle, they discover clues throughout the city, seemingly planted just for them.

The Aldens investigate when a first row seat in an old mystery theater seems to be haunted.

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.

When Benny Alden sees a set of keys that were lost at the library, he follows clues to find the owner.

The Aldens investigate a mystery involving a legendary mining expedition to the gold fields of Alaska.

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.

While staying at a London inn, the Aldens are puzzled by the peculiar behavior of two fellow guests, a mysterious stranger who follows them, and a misplaced antique brooch.

While visiting Lake Lucille in the Adirondack Mountains, the Aldens hear stories about a monster in the lake and then encounter evidence that it may be real.

The Aldens realize the food their dog, Watch, is eating in a commercial and enjoying is not the same as what is being sold in stores, and must decide whether they should continue to allow him to work for the dishonest company.