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.

Florian is 12 years old and has just moved to Washington. He's learning his way around using TOAST, which stands for the Theory of All Small Things. It's a technique he invented to solve life's little mysteries. But when he teaches it to his new friend Margaret, they uncover a mystery that isn't little. In fact, it's huge, and it involves the National Gallery, the FBI, and a notorious crime syndicate known as EEL. Can Florian decipher the clues and finish his homework in time to help the FBI solve the case?

Charlie Thorne is a genius. Charlie Thorne is a thief. Charlie Thorne isn’t old enough to drive. And now, it’s up to her to save the world.... Decades ago, Albert Einstein devised an equation that could benefit all life on earth - or destroy it. Fearing what would happen if the equation fell into the wrong hands, he hid it. But now, a diabolical group known as the Furies are closing in on its location. In desperation, a team of CIA agents drags Charlie into the hunt, needing her brilliance to find it first - even though this means placing her life in grave danger.

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.

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.

Tim is just a peasant, but he dreams big. He wants more out of life than to grow up to be a woodsman like his father. Unfortunately, the only route to success in the kingdom of Wyld is to be born a prince. Still, Tim is determined. He is brave and clever and always tries to do the right thing—even though he rarely gets the credit for it.

When a category three hurricane hits Miami Beach, it uncovers a body buried at the renowned Moroccan Hotel. The body is identified as the man who served as the hotel’s bell captain sixty years ago…and the presumed culprit of the million-dollar jewel heist that took place just before his disappearance.

When a herd of elephants interrupts the big Friday night football game, the police enlist Teddy and his father to assist them in getting the animals safely back home to the elephant sanctuary. Only when they arrive, their owners realize one of the elephants has gone missing! The lone African elephant, Tanzy, is still out there somewhere.

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.

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.

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.

Twelve-year-old Lola Benko has learned a lot from her archaeologist dad. They've spent most of her life globe-trotting to far-flung locales, chasing elusive artifacts and lost treasures. There are downsides—living out of a suitcase and no true BFF, to name a couple—but every day is an adventure. And they have each other. That is, until the day Lola's father disappears. The official line is that he was caught in a flash flood, but Lola's quick research shows the day in question was perfectly pleasant. And if he were truly gone, she would feel it.

Eli Frieden lives in the most perfect town in the world: Serenity, New Mexico. In this idyllic place, every lawn is perfectly manicured, and everyone has a pool and a tree house. Honesty and integrity are valued above all else. The 30 kids who live there never lie--they know it's a short leap from that to the awful problems of other, less fortunate places. Then one day Eli bikes to the edge of the city limits, and something so crazy and unexpected happens, it changes everything.

Trey knows how the trick works: His dad gets him into a school full of kids with rich parents. Trey makes friends, and his dad makes connections. Soon, there’s the con, where Trey’s dad suckers the other parents into giving him money for one of his schemes. Once the money’s in the bank, Trey, his sister, and their dad go on the run … until they set up somewhere else and start again.

The only thing Cassie enjoys is the volunteer work she does at her local library with her classmate and kind-of friend Joe. After a very intense storm, they discover an abandoned kitten. Figuring the kitten needs a friend just as much as she does, Cassie names him Albert and takes him home with her. Soon Cassie begins to notice that Albert is acting . . . strange. He seems to have impossible strength. Cassie swears she sees plumes of smoke rising from his water bowl. And one day, while Albert is in the room, a unique symbol appears on Cassie's closet door.

When a category three hurricane hits Miami Beach, it uncovers a body buried at the renowned Moroccan Hotel. The body is identified as the man who served as the hotel’s bell captain sixty years ago…and the presumed culprit of the million-dollar jewel heist that took place just before his disappearance.

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.

Florian is 12 years old and has just moved to Washington. He's learning his way around using TOAST, which stands for the Theory of All Small Things. It's a technique he invented to solve life's little mysteries. But when he teaches it to his new friend Margaret, they uncover a mystery that isn't little. In fact, it's huge, and it involves the National Gallery, the FBI, and a notorious crime syndicate known as EEL. Can Florian decipher the clues and finish his homework in time to help the FBI solve the case?

When eleven-year-old Hank’s mom doesn’t come home, he takes care of his toddler sister, Boo, like he always does. But it’s been a week now. They are out of food and mom has never stayed away this long… Hank knows he needs help, so he and Boo seek out the stranger listed as their emergency contact. But asking for help has consequences. It means social workers, and a new school, and having to answer questions about his mom that he's been trying to keep secret. And if they can't find his mom soon, Hank and Boo may end up in different foster homes—he could lose everything.

Down at the bottom of the tall buildings of New York City, Magnolia Wu sits inside her parents’ laundromat. She has pinned every lost sock from the laundromat onto a bulletin board, in hopes that customers will return to retrieve them. But no one seems to have noticed. In fact, barely anyone has noticed Magnolia at all. What she doesn’t know is that this is about to be her most exciting summer yet. When Iris, a new friend from California arrives, they set off across the city to solve the mystery of each missing sock.

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".

Trey knows how the trick works: His dad gets him into a school full of kids with rich parents. Trey makes friends, and his dad makes connections. Soon, there’s the con, where Trey’s dad suckers the other parents into giving him money for one of his schemes. Once the money’s in the bank, Trey, his sister, and their dad go on the run … until they set up somewhere else and start again.

Andrew’s just trying to make it through Picture Day, which is easier said than done when it seems like the whole world is out to get him—from a bully to a science experiment gone wrong to a someone else’s juice snot (don’t ask). But as Andrew goes through the school day, and as one thing after another goes wrong, that little kernel of worry in his stomach is getting hotter and hotter, until it threatens to pop and turn into a public panic attack, his worst fear. He tries to keep his anxiety at bay, but the news that his grandmother with Alzheimer’s is missing is too much.

A contemporary My Side of the Mountain, Stranded is the story of a wilderness-hungry Black girl from Manhattan whose journey in the Adirondack mountains becomes a nail-biting story of courage, independence, and survival.

Juni lives in a world without books. The Blight killed off all the trees, and since then, paper is worth more than just about anything else. Juni’s parents were killed in an archeological dig when she was young, so now it’s just her and her Grandpa Edgar, trying to survive. When she’s not in school, Juni and her friends Doler and Quaze turn to plifting—scavenging in abandoned buildings for any scrap of paper they can find—to earn a little money. If Juni can find enough paper, she can pay for the expensive health care Grandpa needs.

Princess Marigold—who hadn't yet been born when the remarkable Princess Rosalind was kidnapped—is eleven when the unthinkable happens: her older sister escapes her captivity and comes home. Marigold has always known she's not as good, sweet, or kind as the sister everyone adores, but amid the celebration of Rosalind's return, Marigold realizes something new: if Princess Rosalind is good, then Princess Marigold must be wicked. And there's no place for wickedness in the kingdom. When Marigold tries to find a new place for herself in an evil wizard's fortress, though, the results are disastrous.

Charlie Thorne is a genius. Charlie Thorne is a thief. Charlie Thorne isn’t old enough to drive. And now, it’s up to her to save the world.... Decades ago, Albert Einstein devised an equation that could benefit all life on earth - or destroy it. Fearing what would happen if the equation fell into the wrong hands, he hid it. But now, a diabolical group known as the Furies are closing in on its location. In desperation, a team of CIA agents drags Charlie into the hunt, needing her brilliance to find it first - even though this means placing her life in grave danger.

Zeke and Daniel have just been made hall monitors by Principal Wombat. This has nothing to do with the fact that they are monitor lizards. And never mind the fact Alicia, the only other monitor lizard in the school, is also a hall monitor. Somehow, the three hall monitors must impose order on arrogant lions, excitable seals and super-relaxed pandas. And worst of all, there is Pelicarnassus! A pompous giant pelican and the son of a major supervillain, who inexplicably has it out for the lizards.

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.

Seventh grade begins, and Kareem’s already fumbled it. His best friend moved away, he messed up his tryout for the football team, and because of his heritage, he was voluntold to show the new kid—a Syrian refugee with a thick and embarrassing accent—around school. Just when Kareem thinks his middle school life has imploded, the hotshot QB promises to get Kareem another tryout for the squad. There’s a catch: to secure that chance, Kareem must do something he knows is wrong.