Sara Martinez is a hacker. She recently broke into the New York City foster care system to expose her foster parents as cheats and lawbreakers. However, instead of being hailed as a hero, Sara finds herself facing years in a juvenile detention facility and banned from using computers for the same stretch of time. Enter Mother, a British spy who not only gets Sara released from jail but also offers her a chance to make a home for herself within a secret MI5 agency. Operating out of a base in Scotland, the City Spies are five kids from various parts of the world.

Before Jake’s grandfather died, he was on the trail of a centuries-old mystery. And he has entrusted that mystery to Jake, leaving behind a set of hidden codes, riddles, maps, and other clues that lead Jake and his friends on a scavenger hunt into the heart of Colorado’s wild and rugged Rocky Mountain National Park.

Ben Ripley may only be in middle school, but he's already pegged his dream job: CIA or bust. Unfortunately for him, his personality doesn't exactly scream "secret agent". In fact Ben is so awkward, he can barely get to school and back without a mishap. Because of his innate nerdiness, Ben is not surprised when he is recruited for a magnet school with a focus on science - but he's entirely shocked to discover that the school is actually a front for a junior CIA academy.

Middle school is hard. Solving cases for the FBI is even harder. Doing both at the same time - well, that's just crazy. But that doesn't stop Florian Bates! Get to know the only kid on the FBI director's speed dial - and several international criminals' most wanted lists - in this adventurous series that School Library Journal says combines "elements of Alex Rider, James Bond, and Sherlock Holmes".

On a family trip to Paris, Greg Rich's parents disappear. They're not just missing from the city - they're missing from the century. So, Greg does what any other 14-year-old would do: He travels through time to rescue them. Greg soon finds out that his family history is tied to the legendary Three Musketeers. But when he meets them, they're his age, and they'll only live long enough to become true heroes if he can save them.

Teddy Fitzroy, his family, and some other FunJungle employees have been invited to visit a bison ranch just outside Yellowstone National Park that FunJungle’s owner, J.J. McCracken, is considering purchasing. But as usual, trouble isn’t far behind. The ranch’s endangered bison have been mysteriously disappearing. Then a massive local grizzly bear named Sasquatch breaks into the house, causing chaos. In the aftermath, Kandace McCracken discovers that her exceptionally expensive sapphire necklace has vanished.

After an escaped kangaroo starts a fire that burns down his house, Teddy Fitzroy accepts an invitation to go to Malibu with his girlfriend, Summer, and her mother, Kandace. He’s hoping to spend some time relaxing on the beach, but wherever Teddy goes, trouble isn’t far behind. First, a massive dead whale has washed up on the beach—and before anyone can determine what killed it, it explodes. Doc, the head vet from FunJungle, suspects something fishy is going on and ropes Teddy and Summer into helping him investigate.

Twelve-year-old Theodore “Teddy” Roosevelt Fitzroy believes that Henry, the hippopotamus at the brand-new FunJungle, has been murdered. The zoo’s top brass claim the hippo went belly up the natural way, but Teddy and his feisty friend Summer McCraken have other ideas. Could the culprit be FunJungle’s animal-hating head of operations? Or is it FunJungle’s owner - Summer’s dad - a man who is much more concerned about money than animal welfare? The deeper Teddy and Summer dig, the more danger they’re in - because when it comes to hippo homicide, the truth can’t be caged!

Trille and Lena may be getting older, but they still find everyday adventure - and trouble - in their coastal village, including sinking every raft they build, getting little sisters stuck up flag poles, and attending those dreaded music lessons. But that’s not all. The arrival of a less-than-encouraging new soccer coach is putting twelve-year-old Lena's goalkeeping career in doubt. And Trille is wondering how to impress the girl who has just joined his class.

Like his fellow lunarnauts - otherwise known as Moonies - living on Moon Base Alpha, twelve-year-old Dashiell Gibson is famous the world over for being one of the first humans to live on the moon. And he's bored out of his mind. Kids aren't allowed on the lunar surface, meaning they're trapped inside the tiny moon base with next to nothing to occupy their time - and the only other kid Dash's age spends all his time hooked into virtual reality games.

After a botched escape plan from her boarding school, Abigail is stunned to discover the school is actually a cover for an elite spy ring called The Center, along with being training grounds for future spies. Even more shocking? Abigail's mother is a top agent for The Center and she has gone MIA, with valuable information that many people would like to have - at any cost. Along with a former nemesis and charming boy from her grade, Abigail goes through a crash course in Spy Training 101, often with hilarious - and sometimes painful - results.

Most kids have enough to deal with between school, homework, extracurricular activities, and friends, but Molly Bigelow isn't your typical tween. By day, Molly attends MIST - the Metropolitan Institute of Science and Technology - but it's what she's learning outside of school that sets her apart from her classmates. Molly is a zombie hunter, just like her mother.

What would happen if you discovered that your family was one of the most powerful in human history? What if you were told that the source of the family's power was hidden around the world, in the form of 39 Clues? What if you were given a choice - take a million dollars and walk away...or get the first Clue? If you're Amy and Dan Cahill, you take the Clue - and begin a very dangerous race.

Charlie Thorne is a genius. Charlie Thorne is a renegade. Charlie Thorne isn’t going down without a fight. After tracking down incredible discoveries by Einstein and Darwin, Charlie is back. This time, the great ruler Cleopatra has left behind an extremely valuable and powerful treasure, its location encoded on an ancient stone tablet.

Meet Holling Hoodhood, a seventh-grader at Camillo Junior High who must spend Wednesday afternoons with his teacher, Mrs. Baker, while the rest of the class has religious instruction. Mrs. Baker doesn’t like Holling - he’s sure of it. Why else would she make him read the plays of William Shakespeare outside class? But everyone has bigger things to worry about, like Vietnam.

For 12-year-old Emily, the best thing about moving to San Francisco is that it's the home city of her literary idol: Garrison Griswold, book publisher and creator of the online sensation Book Scavenger (a game where books are hidden in cities all over the country and clues to find them are revealed through puzzles). Upon her arrival, however, Emily learns that Griswold has been attacked and is now in a coma, and no one knows anything about the epic new game he had been poised to launch.

Kay’s life is pretty boring. She goes to school, spends quiet evenings at home with her foster mom, and has the occasional brush with mischief thanks to her best and only friend Will. But everything is about to change. One night, Kay tags along on another one of Will’s adventures, and they both end up recruited by a talking fox to become Netherjacks, protectors of all the worlds. Once they arrive at the training academy, though, Will is paired with a legendary Netherwing mount and quickly rises in the trainee ranks, leaving Kay behind with barely a glance.

When Mona the Mouse stumbles across the wondrous world of the Heartwood Hotel in the middle of a storm, she desperately hopes they'll let her stay. As it turns out, Mona is precisely the maid they need at the grandest hotel in Fernwood Forest, where animals come from far and wide for safety, luxury, and comfort. But the Heartwood Hotel is not all acorn souffles and soft moss-lined beds. Danger lurks, and as it approaches, Mona finds that this hotel is more than a warm place to spend the night. It might also be a home.

A mouse has to do what a mouse has to do. Ragweed is determined to see the world. He leaves his family and cozy country home and sets off by train for the big city. What wonders await him: music, excitement, new friends … and cunning, carnivorous cats! Silversides is the purring president of F.E.A.R. (Felines Enraged About Rodents), a group dedicated to keeping cats on top, people in the middle, and mice on the bottom. Can Ragweed and his motley yet musical crew of city nice—Clutch, Dipstick, Lugnut, and Blinker—band together to fight their feline foe?

The Menagerie trilogy comes to a fantastic conclusion in Krakens and Lies, the third magical and mysterious adventure from Tui T. Sutherland and Kari H. Sutherland. Someone has been sabotaging the Menagerie, and Logan and Zoe are on the case. But their troubles only get worse when the basilisk escapes its enclosure and the merpeople go on strike - leaving the kraken to its own devices. The race is on to solve the mystery and save the Menagerie in this riveting, action-packed finale!

Harriet Hamsterbone is not your typical princess. She may be quite stunning in the rodent realm (you'll have to trust her on this one), but she is not so great at trailing around the palace looking ethereal or sighing a lot. She finds the royal life rather...dull. One day, though, Harriet's parents tell her of the curse that a rat placed on her at birth, dooming her to prick her finger on a hamster wheel when she's 12 and fall into a deep sleep. For Harriet, this is most wonderful news: It means she's invincible until she's 12!

Ten-year-old George Calder can't believe his luck - he and his little sister, Phoebe, are on the famous Titanic, crossing the ocean with their aunt Daisy. The ship is full of exciting places to explore, but when George ventures into the first-class storage cabin, a terrible boom shakes the entire boat. Suddenly water is everywhere, and George's life changes forever.

When Max - Maxine Zealster - befriends her new robot classmate, Fuzzy, part of Vanguard One Middle School's new Robot Integration Program, she helps him learn everything he needs to know about surviving middle school - the good, the bad, and the really, really, ugly. Little do they know that surviving sixth grade is going to become a true matter of life and death, because Vanguard has an evil presence at its heart: a digital student evaluation system named BARBARA that might be taking its mission to shape the perfect student to extremes!

Three complete stories in one collection! Includes The Mystery Girl, The Mystery Cruise, and The Disappearing Friend Mystery. In The Mystery Girl, Henry, Jessie, Violet, and Benny are working in a general store to help out a friend of Aunt Jane’s. It seems to the children that the young girl who works in the store is behaving very strangely. She seems nervous and won’t answer any questions about her past. Then a strange man comes to the store asking about her. What secret is the mystery girl hiding?

The Woodshed Mystery: The Alden children are staying at the New England farmhouse where their grandfather grew up. There are many stories and legends about the old farm, and there’s a woodshed near the house that holds a surprising secret... a secret that dates all the way back to the Revolutionary War! The Lighthouse Mystery: When the Aldens take a summer trip to the New England coast, they have a fun place to stay: a lighthouse!

With his mother dead, his father gone, and his older brothers and sisters unable to help, eight-year-old Ethan Cooper knows it's his responsibility to keep him and his younger siblings together - even if that means going to an orphanage. Ethan, Alice, Simon, and Will settle into the Briarlane Christian Children's Home, where there's plenty to eat, plenty of work, and plenty of talk about a father who never leaves. Even so, Ethan fears losing the only family he has. How can he trust God to keep him safe when almost everything he's known has disappeared?

What do you get when you add up one middle school bully, two bank robbers, 57 puppy-mill dogs, 4,000 missing dollars, and five daring troublemakers led by the incomparable Riley Mack? One crazy caper! In this merry, mischievous romp, master storyteller Chris Grabenstein, the award-winning author of Escape From Mr. Lemoncello's Library, teams with a full-cast of audio talent to introduce Riley Mack, a one-of-a-kind 12-year-old hometown hero.

Hightech und gefährliche Abenteuer! Der 12-jährige Cruz bekommt einen der begehrten Plätze an der "Explorer Academy", einer exklusiven Schule für zukünftige Forscher und Entdecker. Dort hatte auch seine Mutter gearbeitet, bevor sie bei einem mysteriösen Laborunfall ums Leben kam. Cruz stürzt sich begeistert in die Welt der Academy voller gefährlicher Missionen und neuester Hightech-Instrumente. Zusammen mit seinen Freunden begibt er sich auf die Suche nach dem Vermächtnis seiner Mutter - einer sehr wertvollen chemischen Formel, an der auch gefährliche Gegner größtes Interesse haben.

Dan Brown meets Jason Bourne in this riveting middle-grade mystery thriller. When a young boy is discovered in Washington DC's National Gallery without any recollection of who he is, so begins a high-stakes race to unravel the greatest mystery of all: his identity. As the stakes continue to rise, the boy must piece together the disjointed clues of his origins while using his limited knowledge to stop one of the greatest art frauds ever attempted.

Most kids have enough to deal with between school, homework, extracurricular activities, and friends, but Molly Bigelow isn't your typical tween. By day, Molly attends MIST - the Metropolitan Institute of Science and Technology - but it's what she's learning outside of school that sets her apart from her classmates. Molly is a zombie hunter, just like her mother.