The Aldens help out at a minor league stadium and investigate when it appears someone in the ballpark is stealing the home team pitcher's signals and relaying them to the batters of the other team.

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?

When the Alden children join a group of volunteers to fix up an old house for senior citizens, they try to explain the puzzling behavior of their coworkers as well as investigate some unusual events.

"In the town of Sleepy Hollow, the Aldens discover an old legend that's come back to life! Their friend's ghost-tour business is being disrupted by a spooky figure on horseback who throws pumpkins in the streets and frightens everyone. Has the headless horseman returned to haunt the town? The Boxcar Children must find out before the ghost tours are ruined!"--Jacket flap.

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.

While visiting the Outer Banks of North Carolina, the Aldens see a mysterious wild horse that may be a ghost.

Six children help solve the mystery of a missing spyglass that has kept two brothers feuding for years.

The Aldens are visiting Port Elizabeth when a bad storm rolls in, knocking out the power--and leaving behind a mystery! Can the powered-down Aldens figure out what's going on?

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

Jessie wants her science fair project to make a difference. So when she gets the chance to test a local creek for pollution, she can't wait to get started. But when things start going wrong with her experiment, Jessie and her siblings don't just have an experiment to investigate, they have a mystery to solve!