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When Mr. Stone died he had only one relative, his grandson, Graham. Graham had been informed that he was to have the one thing of value on the farm, known only as “mystery boy.” Unfortunately, no one knew who or what “mystery boy” was. The Hollisters, therefore, were quite surprised to find that the hobbyhorse they purchased at the sale held the key to the identity of this strange bequest.

Telly has everything a girl could want: a wealthy family, a luxurious home, and an excellent private education. But she doesn’t want any of that. She wants to be normal, like the other kids. So when her parents enroll her in public school, she’s ready to have fun, make friends, and...solve mysteries? When she meets Sebastian, a new student from London who claims to be a detective, they form an unlikely duo and take on the mysteries of their school.

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.

This year’s Bark at the Park event at the Middleburg Red Dogs baseball stadium could not have gotten off to a worse start. The first pitch hasn’t even been thrown yet, and there’s already been a furry intruder, a dog stampede and a kidnapped mascot. Now it’s up to Leila and Kait, along with their dogs Nugget and Baxter, to rescue Red Dogs’ mascot and save Bark at the Park. It’s a race to solve the mystery before the final out!

Fernando, an eight-year-old boy detective, and his parrot Ziz, travel to different countries to solve mysteries. Now they are traveling to Panama to visit their friend. A mystery awaits them! Follow along and enjoy listening about their adventure, as they visit exotic places searching for clues!

Christmas is almost here, and Alice-Miranda and her closest friends are celebrating early at Highton Hall. But it's not all gingerbread, parties and present shopping. There are mysteries to be solved! Why are Christmas decorations disappearing and local stores empty of festive treats? What long-kept family secret does Alice-Miranda discover? More importantly, what will she do about it?

On a visit to a coastal harbor town, the world is Noah’s oyster as long as the stormy weather doesn’t ruin the fun. Summer break has just begun, and with seven days of freedom, how much trouble can 13-year-old Noah, his best friend, and his sister really find? Plenty, as it turns out. Because when the kids go snooping around an old decommissioned lighthouse, its troublesome secrets begin to reveal themselves, and the kids are about to stumble upon a hundred-year-old mystery that still haunts the nearby fishing village.

It’s the height of summer in Moreland, and Grace Griffin and her fellow warden Tom Eely are sweltering in the heat until they answer a strange call for help that comes through on the amazing Griffin map. After teleporting to Oakwell, they find the town paralysed by a freezing snowstorm, which is ruining the famous summer market that brings in visitors and trade. Using their mystery-solving skills and amazing inventions, can Grace and Tom find the cause for the weird weather and restore summer from the snow?

Ben Ripley and his friends are training in Alaska when Cyrus Hale is kidnapped by his old Russian nemesis. Ben, Erica, and the others mount a rescue mission, but events quickly spiral out of control in a plot involving the secret history of US-Russian relations, a young KGB agent with skills to rival Erica’s—and lots and lots of bears.

At the elite West Archer Academy, all the students are gifted, but four are exceptional. Though the Evers look twelve, they're actually centuries old, possessing knowledge and talents that make them extraordinary. And boarding school is the perfect cover for their brilliance—and their secret.

No self-respecting Head of Ranch Security would be caught dead sleeping on the job...so when Slim catches Hank asleep, not once but TWICE, Hank knows something sinister is afoot. And, if that's the case, then odds are that Pete the Barncat is involved. Later that day, the case takes an interesting twist when Hank learns that Pete has been missing for two days! Worried about her precious kitty, Sally May asks Slim and Hank to find and rescue Pete from whatever trouble he might’ve found himself in.

A mysterious figure is stealing from clubs all over Rutherford High! When the thief strikes just as Art Club is getting ready for a big show, everyone is worried the exhibition will be cancelled. As suspicion falls on one of the Breakfast Club Investigators, Marcus and friends must race against time to find the stolen painting and unmask the true thief before it's too late!

Valdez Jones VIII calls himself Wrecker because his great-great-great-great-great-grandfather salvaged shipwrecks for a living. So is it destiny, irony, or just bad luck when Wrecker comes across a speedboat that has run hard aground on a sand flat? The men in the boat don't want Wrecker to call for help—in fact, they'll pay him to forget he ever saw them. Wrecker would be happy to forget, but he keeps seeing these men all over Key West—at the marina, even in the cemetery. And now they want more than his silence—they want a lookout.

Being a brilliant 10-year-old in a competitive eighth grade honors class is a minute-by-minute challenge. Outside school, more challenges abound. When Jack the polar bear’s regular zookeeper is the victim of a mysterious hit-and-run accident, Super Sleuths Sophia and Pedro find themselves investigating his replacement. A replacement whom Jack and the seals fear and distrust.

When Tilly, Oskar, Milo and Alessia venture into Arthurian legend to find the first bookwanderer – the wizard Merlin – they discover that everything they thought they knew about bookwandering might be wrong. Working together to figure out how to untangle the Alchemist's grip on the world's imagination, save Pages & Co. and defeat an unexpected enemy, they learn about the true power of imagination in a journey through myths and legend that will help them to save the very foundations of bookwandering.

After defeating the Crowood witch and saving the day, Ivy, Maggie and the rest of the Double Trouble Society are on the lookout for their next big adventure. They won't have to wait long - there are three new kids in town and they're all behaving very mysteriously... The Double Trouble Society know how to handle witches but can they manage vampires, werewolves and ghost as well?

An orchestra explodes in Vauxhall Pleasure Gardens and suddenly the music of London disappears...and a terrifying monster stirs off the Greenwich peninsular, threatening to trample London underfoot. The detectives must track down the thief behind the music's disappearance – via the Whispering Gallery of St Paul's Cathedral, a Windmill-with-teeth on the Isle of Dogs and the dark streets of Soho...where a shadowy villain and his mechanical animal spies live.

When young Arthur Conan Doyle is o­ffered a spot at Baskerville Hall, a secret school for extraordinarily gifted children, he is elated at being chosen—and being given a chance to turn his family’s fortunes around. There, Arthur makes quick friends with Irene Eagle, a girl who boldly strides into action, and Jimmie Moriarty, a boy whose brilliance rivals Arthur’s own. Together, they discover that their new school is a peculiar place, home to leaning towers and unexplained explosions, prowling wolves and extinct birds.

A handful of sixth-graders have been chosen to attend an exclusive weekend at the Octagon Valley Institute, the mysterious, high-tech lab of the uber famous multimillionaire, genius, recluse Onassander Octagon. What will they do there? No one is telling. Which just makes everyone want to get in. Edwin has high hopes for the weekend—hopes he’ll meet other kids like him—kids who will accept him even though he’s got a photographic memory, genius level math skills and some very specific personality quirks. But when he meets the other kids, he starts to wonder if they’re all in the right place.

When Claude's little sister, Amity, runs off in forbidden Badwell Woods—where children disappear—Deliah, Sam and Claude follow her to a mysterious mansion. Inside, time has frozen in the 1930s and an invitation promises a devious party game. Not long after they find a terrified Amity, hiding from 'ghosts', the floor beneath their feet starts to twist and turn: the rooms are changing places. The house has rearranged itself like a giant Rubik's cube. To escape, they must solve the puzzle—and the century-old mystery of a girl who disappeared.