The Aldens are going on a trip to Washington, D.C. They visit lots of interesting places, like the Capitol Building, the Washington Monument, and the Air and Space Museum. But when things start disappearing from their hotel, they realize they are being followed, the children know there’s a mystery in the capital … and it’s up to them to solve it!

The Aldens visit Ireland and stay in a beautiful castle that’s now a hotel! But the caretaker seems very superstitious, and at night they see a mysterious figure who walks the halls carrying a lantern. Could it be one of the banshees of ancient legend? The Boxcar Children must discover the secret that Duncarraig castle is hiding!

The Aldens have promised Grandfather a vacation from mysteries during their island visit. But the promise proves hard to keep when things start to go missing. Then an old fisherman tells Benny of the island’s ghost horse, and late that very night Benny sees a mysterious stallion galloping down the beach. Could the ghost horse have something to do with the disappearances?

Living in a seaside mobile home, the Aldens unravel the secret of two secluded women.

The Aldens join in the effort to save a species of big cat.After helping clean up an oil spill in Connecticut, the Aldens are heading to a much cooler climate, where scientists are working to conserve the snow leopard population. With only hundreds left in the world, the Aldens know each animal is important. Can the Aldens do their part to help save this elusive and important animal?

The Boxcar Children are helping a friend find out more about their family's history. But what they find is a mystery going back generations! Can the Aldens help their friend unlock secrets of the past—and present?

The Boxcar Children are putting their sleuthing skills to the test in a spy competition. Can you help them take the top prize? In this interactive, choose-your-path mystery, readers will help the Aldens make decisions that will either lead them to victory or blow their cover.

The Aldens are joining Dr. Iris Perez as she investigates legendary creatures around the world. In the last leg of the journey, the children travel to the Amazon Rain Forest. They love learning about all the different plants and animals they have never seen before. But is there really a creature in the forest that hasn't yet been discovered?

Black cats? Broken mirrors? The number thirteen? The owner of the art deco apartment building in nearby Silver City believes in all kinds of superstitions. The Aldens aren't so sure about most of them, but there's one thing they do know: something strange is going on on the thirteenth floor. Are they just coincidences, or is the building manager onto something?

The Aldens have joined Dr. Iris Perez as she investigates legendary creatures around the world. In this adventure, the children travel to Iceland to look into stories of mischievous elves causing trouble. The legends of huldufolk, or hidden people, go back a long way in the country, but are elves really the cause of the problems, or is there a more natural explanation for the strange events on the island?

The Boxcar Children are helping harvest honey at a farm one of Grandfather's friends owns. They're excited to learn about bees and eat fresh honey. But then several mishaps occur—is someone trying to ruin the harvest?

The Raptor Rehab Center's reputation is at stake! Can the Aldens figure out who's responsible for the bad press before the center gets shut down for good? Henry, Jessie, Violet, and Benny are excited to learn more about raptors when they volunteer at a rehab center for wild birds. But not long after they arrive, a series of strange events makes it seem like someone might be trying to sabotage the center. Who could the culprit be, and why would they want to cause trouble for injured birds?

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, the more things go wrong. As the children search for the cause of all the bad luck, everything points back to the spooky sarcophagus. Has the museum been struck by the curse of an ancient mummy? The Aldens are about to find out, whether they're ready or not!

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 who has keys to all the cages? The Boxcar Children are determined to solve the mystery before the zoo looses any more rare animals!

Henry, Jessie, Violet, and Benny meet Mr. Hudson, a local author who is best known for his novel about a vampire. But rumors of a real vampire are going around town—a vampire who haunts the graveyard behind Mr. Hudson's house! Since vampires don't exist, the children soon realize that someone must be trying to scare people away! Who brought the old legend back to life—and why?