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Three complete stories in one collection! This volume includes The Mystery Horse, The Mystery at the Dog Show, and The Castle Mystery.

Three complete stories in one collection! Includes The Canoe Trip Mystery, The Mystery of the Hidden Beach, and The Mystery of the Missing Cat.

When the Boxcar Children help out in a local garden, they dig up one strange thing after another! First, the tomato plants seem to move every day. How can that be? Then the Aldens follow the clues to an unsolved bank robbery, and it's clear that a very big mystery is growing in Greenfield.

Dear Diary...Bess, George, and I are actually in Alaska! Everywhere you look, there are massive mountains and sparkling, deep-blue waters. We're on the maiden voyage of the Arctic Star luxury cruise ship, and my old friend, Becca Wright, the assistant cruise director, needs our help. She received threatening emails before even setting sail; then a bloody body turned up in the swimming pool.

Eleven-year-old Birdy and her younger brother, Mouse, have always looked out for each other. They make the perfect team: Birdy is realistic and practical, while Mouse is affable and trusting. After their mother dies of cancer, Birdy and Mouse are forced to move out of the city to the country with relatives they’ve never met. Aunt Mitzie and Uncle Shadow’s house is full of organized chaos, and it takes Birdy time to adjust to having adults around. But the kitchen is always stocked, and both kids are allowed to play outside as often as they want. There’s only one problem: it’s all temporary.

Dear diary... The good news: Bess, George, and I are on a train bound for Denali National Park, gazing at majestic Mount McKinley as we speed along. It's truly awesome! The bad news: Someone - a creepy passenger or a disgruntled employee? - is still causing major trouble on the Arctic Star cruise ship, and now that we're sightseeing on land, the danger has followed. Whoever it is has got even me in their sights - but I've been working undercover, so I have no idea how anyone discovered I'm a detective.

Frank and Joe are back on Black Bear Mountain, the scene of a previous wilderness adventure and mind-bending mystery. This time, the brothers are checking in on Dr. K, a friend they made during their first trip. Dr. K is a fan of living off the grid, but he’s been MIA long enough to cause worry in the small mountain town. And so the teenage detectives Black Bear Mountain relied on before have been called in to help once again.

Three complete stories in one collection! Includes The Celebrity Cat Caper, Hidden in the Haunted School, and The Election Day Dilemma.

This bundle includes The Great Detective Race, The Ghost at the Drive-In Movie, and The Mystery of the Traveling Tomatoes.

This bundle includes The Mystery of the Grinning Gargoyle, The Mystery of the Missing Pop Idol, and The Mystery of the Stolen Dinosaur Bones.

When Jessie and her friends decide to go camping as part of the Weekend in the Woods event, it doesn't take long for them to start discovering strange clues that could have something to do with a hiker who went missing years ago. Soon after they begin their investigation, they start receiving threatening messages from someone who wants them out of the woods―immediately. Could someone be trying to cover up what really happened to the missing hiker? It's up to Jessie to dig up the truth.

Darby Carter loves horses, even though she's never actually ridden one. Darby's grandfather is an expert rider—in fact, he owns a horse ranch in Hawaii. So when he agrees to take her in–along with the beautiful mustang Darby saved on the range in Nevada–she knows she can't refuse, even if she is a little terrified! But Darby's filly arrives in bad shape, and Darby's grandfather wonders if the wild horse will ever trust a human again. Can Darby take the reins and save her horse–or has she lost the mustang forever?

Henry, Jessie, Violet, and Benny are going down under. Off the coast of Australia, they dive in to explore the Great Barrier Reef. With the help of their conservationist guide, Kayla, they learn about ways to help rebuild the damaged reef. But coral reefs take a long time to take shape. Can the Aldens find ways to help the animals that need help now?

When a traveling theater production comes to town, Jessie is excited to write a profile of its star, a talented performer who grew up in Greenfield and is making a big splash around the world. But when the performer goes missing days before the show is set to make its debut, Jessie realizes that something big is going on behind the scenes. If she wants to score a celebrity interview, she’s going to have to solve a mystery first.

Henry, Jessie, Violet, and Benny are off to the rain forests of Sumatra, where a protected piece of land is home to endangered animals such as orangutans, elephants, and tigers. But when part of the forest gets cut down, the Aldens have to figure out who is responsible, not only to protect the rain forest, but also the animals within.

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?

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?

Henry is learning to perform magic tricks from The Amazing Arthur and is excited to participate in Greenfield Magic Shop's annual magic show. But then The Amazing Arthur goes missing. Is his disappearance part of a new magic trick or a mystery?

Samantha and Jen are out camping when they meet Nicholas, a boy traveling cross-country on a beautiful Gypsy Vanner mare. His caravan also includes a young colt. Nicholas says it's a stray, but the colt looks a lot like a missing mustang. When people start getting suspicious, Sam blames discrimination. She sticks up for her new friend and hopes she’s right.

When an embarrassing message between Charla and Daniel goes out to the whole class, Jessie finds herself stuck between her feuding best friends. As she helps Charla investigate how this happened, they find that someone has been tampering with Charla's lawyer mom’s computer, and it could spell trouble for her mom’s legal case. In order to keep the culprit from walking free, Jessie and Charla need Daniel’s help. But when some messages go out, they’re hard to take back.