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(0)Gertrude Chandler Warner
Unusual events start when the Alden children assist with a dinosaur exhibit opening at the Pickering Natural History Museum.
Someone steals the newly refurbished boxcar the Aldens are going to ride at the Greenfield Founder's Day Parade, they only have a couple of days to find it before the event.
The Boxcar children learn how hot air balloons work and even help launch one, but before they get the chance to ride in one they have to figure out who is trying to ruin the rally.
The Alden children find a map that shows how to find a gold loot hidden in an old cabin in Yellowstone, but when they go to investigate they are met with interference.
Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and an exciting new exhibit to explore—from behind the scenes—at their local zoo. But disaster strikes when a pair of rare ferrets is stolen. The two huge California condors are the thief's next target. The Aldens quickly decide that the animals are being taken by someone that works in the zoo. But how do they stop a thief
...Someone tries to sabotage the community theater play of "The Wizard of Oz" that the Aldens are in.
The Boxcar children put their detective skills to use with the neighbor's cat puzzling disappearance.
The Aldens discover that many people are obsessed with the bookstore their grandfather just bought in New Orleans.
While investigating a jewelry store robbery the Aldens must also figure out who's stealing their favorite cereal.
Grandfather has just bought a plot of land in the Rocky Mountains—complete with a ghost town! When the Aldens hear their land is haunted they don't believe it. But when they see a ghostly figure in the main street, they know something's up. There's a mystery and the Aldens are determined to solve it!