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When Mrs. McGregor, the Aldens’ housekeeper, learns that she cannot afford to keep her childhood home, the Crooked House, the Aldens want to help. For years, there has been an unsolved riddle about the house, and solving it could lead to a treasure! Will the treasure save the Crooked House? Can the Boxcar Children find it in time?

As the children tour the famed Sydney Opera House, their next puzzle - and its key - falls right into their laps. They need to find the rightful owner of a rare Australian coin. Using their knowledge about Australia, the Aldens find the coin's owner, but a saboteur is again hot on their heels and nearly spoils their hard work. Next up, the Aldens travel to frigid Antarctica, where they need to return an artifact to the hut Shackleton used on his expeditions to the South Pole.

It’s a big week at Cogwheel Stadium—the Clayton Cogs are playing for the pennant! But the other team’s batters seem to know the pitches too well, and it’s clear someone in the stadium is stealing the Cogs pitcher’s signals. Now the Boxcar Children must find out who is spying for the other team!

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 on the main street, they know something's up. There's a mystery here, and the Aldens are determined to solve it!

An original Sherlock Holmes manuscript was stolen from the Bayport Museum and now pages keep showing up in Frank and Joe's things: their lockers, menus, even the backseat of their car. It's clear someone is out to frame them. But who could it be? The boys try their usual means of deduction, but everything leads to a dead end. They just keep finding unsuspecting people who were paid to hide the pages by a mysterious third party. Frank recognizes this tactic - it's exactly what Moriarty would do to throw off Sherlock Holmes. So the brothers decide to use one of Sherlock's signature ideas.

Nancy’s classmate, Willa, needs her help. Willa is convinced something is terribly wrong with her friend Izzy, but everyone has dismissed Willa’s concerns, saying it’s just teen angst. But Willa thinks it’s more than that; she thinks Izzy is possessed. It all started when Willa and Izzy snuck into an abandoned house with some of their friends. After running around and exploring, Willa went in to the basement and found Izzy staring into space. Izzy was conscious, but she was acting weird—she wouldn’t speak and she didn’t seem to recognize Willa.

The Boxcar Children decide to raise money to help the Greenfield hospital. At Beth’s suggestion, they form a service called The Boxcar Helpers—to babysit, wash cars, mow lawns, and care for pets. But Beth keeps disappearing. And then other things start to go wrong. Is someone trying to put them out of business?

A hip new doughnut shop known for its bizarre recipes is opening up in Greenfield. At first, the owners of the other doughnut shop in town, Delilah's, aren't worried. Their shop has been a fixture downtown since just after World War II. But when the new shop starts making doughnuts that look just like some of Delilah's greatest hits, the Boxcar Children must figure out if it's just a coincidence or if someone from the new shop is stealing Delilah's recipes.

Welcome to Wildcat Crossing! There's horses to ride, a Wild West show - and a mysterious troublemaker on the loose!

When the Aldens first arrive in Elbow Bend, they meet Kate Frances, who tells them all sorts of ghost stories about the town! The scariest tale is about a ghost dog who howls at midnight and appears to warn people of danger! The Aldens think it is just a story until they hear dogs all over Elbow Bend howling at midnight. Does the ghost dog really exist or is someone playing a trick on them? The Boxcar Children are determined to find out.

A twig cracked. I snapped my head to the side, following the direction of the sound, and peered through the greenery. There was nothing there. As I began to turn back around, I caught the slightest motion out of the corner of my eye. Peeking out between clumps of dense vegetation, about 20 feet away, were two eyes. My skin prickled when I realized that they were staring back at me.

Rich girl Lindsay Peyton is throwing the biggest and best Sweet Sixteen bash that Bayport has ever seen. But when Frank and Joe discover that her car has been keyed, it looks like someone isn't so happy that Bayport's princess is showing off. Meanwhile, a group calling themselves the Scaredevils is filming themselves committing random mischief around town - including keying Lindsay's car - which threatens the security of Lindsay's big day.

When a dog training school opens in Greenfield, the Boxcar Children bring Watch in to learn some new tricks! But at the very first class, a Dalmatian goes missing—did the dog run away, or was he stolen? And when a second dog vanishes at the next class, it’s clear that the Aldens have a dog-gone mystery to solve!

While on the beach at a seaside resort, Benny finds a bottle with a tattered piece of paper inside. When the Aldens find out that it’s part of a map that leads to a pirate’s riches, they prepare to search for the buried gold. But the Aldens aren’t the only ones looking for the hidden fortune. Will they be the first to solve the mystery of the pirate’s map? Aye, mateys, this might be the Boxcar Children’s biggest adventure yet.

When their friend Sam gets a letter full of riddles from an eccentric millionaire, the Aldens are eager to help him crack the code. If Sam can solve the puzzle, he will inherit the millionaire's money! But Sam isn't the only one in town to receive a letter - and whoever solves the mystery first will win the prize!

The Alden children are going back in time by helping at an old Victorian house that has been turned into a museum. But rumor has it that the place is haunted by the spirit of practical joker Horace Wagner! Is there really a ghost?

Henry, Jessie, Violet, and Benny are going to visit a castle! Built long ago, the castle is now being turned into a museum. As the Boxcar Children help to restore it, they see mysterious lights and hear strange music. Faces appear in windows—and then disappear. Can the children solve the mystery hidden within the castle’s walls?

"I do have an idea. The most important thing, though," I said to Margot, Mrs. Marvin, and Catherine, "is for you to act completely normal. Our big advantage is that the thief doesn't think that anyone will check the safe until we're already back in River Heights and he or she is off the boat. The culprit has no idea that we're looking for him or her."

The Boxcar Children have a chance to be in a real play - The Wizard of Oz! Jessie is chosen for the Cowardly Lion. Benny will play a munchkin. Even Watch has a part and all the Aldens are helping with the show. Then mysterious things begin to happen. Someone makes a threatening phone call and a costume is destroyed. Maybe the show won’t go on - unless the Boxcar Children can solve the mystery before opening night!

Henry, Jessie, Violet, and Benny chart a course for China to return the Reddimus Society's fourth artifact! Along the way they meet old friends and make new ones, but a thief threatens to ruin their trip. Then, after an unexpected stop in Thailand, they meet a suspicious man claiming to work for the Reddimus Society. The Aldens wonder if someone close to them is working for the other side. Who can the Boxcar Children trust to help them?