It's summertime, and Henry and Benny are excited about their new jobs in the local department store. When a valuable vase disappears, the manager suspects the boys of causing trouble. They're innocent, but who is responsible for all the suspicious things going on? It's up to Benny to uncover the mystery. . . .
The Alden children travel on a Mississippi paddle-wheel steamer to visit an old family friend in his cabin near Hannibal, Missouri, and try to discover who is responsible for the mysterious activities near the house.
At the same time that the Alden children's efforts to raise money for a new hospital wing are being sabotaged by nasty tricks, they find their attempts to befriend the new girl Beth frustrated by her strange behavior.
When their grandfather arranges for them to spend two week at Sunny Oaks, the four Alden children enjoy settling into the routines of farm life but become suspicious about a mysterious horse locked in the stables.
While visiting a Navaho Indian reservation in New Mexico, the Aldens try to save a forest under threat of development by proving it is the site of a lost, buried village, but someone is sabotaging their dig.
While visiting a friend of their grandfather's on Sullivan's Island, off the coast of South Carolina near Charleston, the Boxcar Children encounter mysterious activities related to rumors of a buried pirate treasure.
While the Aldens are visiting a friend of Grandfather's at the beach, Benny finds a long-lost piece of a map to a legendary pirate treasure, a discovery that brings unwanted attention from fortune hunters.
When an elderly friend is injured, the Alden children offer to help him with his window-washing business in their small town of Greenfield and agree to help him solve a riddle that has arrived in a mysterious invitation.
Henry, Jessie, Violet, and Benny Alden, The Boxcar Children, are helping the Greenfield Museum set up an exhibit about ancient Egypt, when all sorts of strange things begin to go wrong! Is the spooky sarcophagus really cursed, or is someone trying to make sure the exhibit isn't successful? The children are sure to find out, whether they're ready or not.
While Henry, Jessie, Violet, and Benny help a friend fix up an old mansion filled with skeletons belonging to the doctor who once lived there, statues begin disappearing from the mansion grounds and a walking skeleton may be the culprit.
The children are competing in an invention convention held in the home of a famous inventor known for her one-of-a-kind clocks, and it appears that the clock-bongs aren't the only noises at midnight, as something else is also making a mysterious tapping sound.
The Alden children are helping out at a radio station, and they're going to be actors in a live mystery show. But when strange things keep happening, people in town say the station is haunted. Can the Boxcar Children catch the radio ghost before the station's listeners are scared away?
When the Aldens help a friend of their grandfather's to build the world's largest yo-yo, they soon discover that more than one person is trying to prevent them from finishing the job--and for more than one reason.
The Aldens are helping out at a rescue ranch for horses. Jessie's favorite is a beautiful horse named Dragon. When Dragon and other horses disappear from the pasture, the Boxcar children must saddle up for a mystery. What's happening to the horses at the Dare To Dream Ranch?
A local radio station is holding the Great Detective Race, and the Boxcar Children have entered the contest! They solve riddles and search all over town for clues leading to the grand prize. But when some of the clues turn out to be fake, it's clear that someone is playing unfairly! Who could be trying to ruin the race - and why?
The Aldens discover there's nothing more fun than a drive-in movie. But pranks and other odd things are happening at the Diamond Drive-In, and late at night, a ghost is seen walking around the empty lot. Is the old theater really haunted?
When the children uncover a strange puzzle in a friend's back yard, it's the start of a "spy game" leading to gold. But first they must make sense of an old photo and a riddle, and learn just who is behind this mystery within a mystery.