Henry, Jessie, Violet, and Benny are happy to share their home with Katya, the young gymnast, and watch her practice for the big competition. When things start going wrong at the gym it quickly becomes clear that someone is trying to ruin Katya's chances of winning—but who?   The Aldens want to help. The trouble is, Katya's been acting a little mysterious herself—almost as if she's got something to hide. But what? Can the Boxcar Children solve both mysteries before the big competition?

While visiting Pikesville, New York, the Boxcar Children join the exciting last games of the season in a strange old ballpark behind an abandoned factory. The Pikesville Half Moons are playing the Eagles, but the Eagles seem to be hitting far too many home runs. Could they be cheating? Then Violet sees strange lights in the old factory at night. Could the lights—and the losing streak—have anything to do with the sad Pikesville legend of Home Run Herman? The Boxcar Children find out there's more to be lost in Pikesville than a baseball game.

One stormy afternoon, the Aldens take a shortcut through the Greenfield Cemetery and discover a strange local superstition! According to legend, it's good luck to leave presents in a certain spot in the cemetery—and bad luck to anyone who doesn't. But since there's no such thing as ghosts, there must be a reason for this weird tradition. The Boxcar Children are determined to find out what it is.

 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 Mystery of the Singing Ghost   Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and are excited because their cousins are moving to Greenfield.   The Boxcar Children decide to fix up the house that cousins Joe and Alice have bought. There's just one problem. It seems to be haunted—by a ghost that sings! Is someone trying to keep Joe and Alice from moving in?   The Mystery of the Mummy's Curse   Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they're about to meet a mysterious mummy!   The Greenfield Museum is holding a special exhibit all about ancient Egypt, and the main attraction is a 4,000-year-old mummy. The Aldens are helping the museum curator set up the exhibit and learning all about life in ancient Egypt. But ever since the mummy arrived, nothing's gone right for the museum or its workers. The longer the Aldens are around the mummy,...

Someone tries to sabotage the community theater play of "The Wizard of Oz" that the Aldens are in.

The Alden's neighbor, Lina, thinks there's treasure hidden in her attic, and she wants the Boxcar Children to help her find it. Of course, the children are eager to help search—but it appears they aren't the only ones looking for the treasure. Can the Boxcar Children discover the treasure in the attic ... before someone else finds it first?

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather and they have become friends with a real pro-hockey player.   The Boxcar Children cannot believe it when they meet their favorite hockey star, Kevin Reynolds, while out skating one day. Kevin is coaching a girls' hockey team and planning to build a huge new skating rink right in Greenfield. Kevin offers Jessie a place on the team and Henry is going to be assistant coach! As soon as practices begin, however, strange things start to happen. Suddenly, equipment is missing and Kevin's plans for the new rink are almost ruined. Is someone trying to prevent Kevin's new rink from being finished? The Boxcar Children want to help their new friend and solve this mystery!

The Aldens discover there's nothing more fun than a drive-in theater, where they can eat popcorn in the car and watch movies under the stars! But pranks and other odd things keep 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?

Several incidents threaten to disrupt the winter games at the Snow Haven Lodge where the Alden children and their grandfather are staying.

The Boxcar Children have entered the Ruby Hollow Gem Mine's annual gem-hunting competition. With a little instruction and the right gear, the Aldens have everything they need to become real rock hounds! They have a natural talent for rock-finding, and it's not too long before Jessie makes a fabulous find. But before she can enter her ruby in the competition, it disappears! Could there be a thief at the mine? Now, instead of digging for rocks, the Aldens are digging for clues. Who wants to win the contest so much that they are willing to steal from the Aldens? The children don't know, but they are determined to find out!

 People line up around the block to buy Mama Tova's cupcakes. But who could be trying to steal her secret recipe? The Aldens follow the clues to a cupcake contest, where they must find a thief using their mystery-solving skills—and their taste buds, too!

The Aldens are at Wildcat Crossing, a recreated frontier town full of cowboy fun! But when horses disappear and other pranks threaten to ruin the Wild West show, the Boxcar Children must find out who's the varmint causing all the trouble!

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they are working at a mall owned by his friend. When the Aldens arrive at Hope Harbor, they're excited to see the crowds of shoppers and the endless variety of stores. But as they begin to work at Penny's Emporium, a novelty shop in the mall, everything starts to go wrong. Some of the other mall workers don't seem to want the Aldens' help. Even worse, some of the merchandise bound for Penny's Emporium has disappeared. What's going on at Hope Harbor Mall? It's up to the Boxcar Children to figure out who's behind this mystery.

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they are visiting the Crooked House, Mrs. McGregor's childhood home in the snowy countryside.   When Mrs. McGregor, the Aldens Housekeeper, learns that she cannot afford to keep the Crooked House, the Aldens want to help. Mrs. McGreggor tells them that ever since she was a little girl, there was an unsolved riddle about the house. And solving that riddle could lead to a treasure! Could the treasure save the Crooked House? Can the Boxcar Children find it in time?