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.

The Cahill family has a secret. For five hundred years, they have guarded the 39 Clues - thirty-nine ingredients in a serum that transforms whomever takes it into the most powerful person on earth. If the serum got into the wrong hands, the disaster would rock the world. So certain Cahills have always made it their mission to keep the serum safe, buried, locked away. Until now. Thirteen-year-old Dan Cahill and his older sister, Amy, are the latest guardians of the Clues. They think they've done everything right, but a tiny mistake leads to catastrophe.

Amy and Dan find themselves in a new global race but this time, everything’s different. Those closest to them might be working for the enemy, and Amy and Dan are forced to ask themselves how far they’re willing to go to save the kidnapped Cahills. How much can you risk when there’s no one to trust?

Calling all Cahills! Announcing a 39 Clues Superspecial adventure - the gang is back, and called to investigate one of their own: Sinead Starling.

For 500 years, the Cahills have been the most powerful family in the world. For 500 years, they've protected the source of their power - the 39 Clues. And for 500 years, they've kept their secrets silent. Until now. This extraordinary stand-alone novel cracks open the Cahill vault to tell the story of the most coveted piece of artwork in the world, a masterpiece that has been the target of seven separate theft attempts: Jan van Eyck’s altarpiece at Ghent.

On a foggy night in Amsterdam, a man falls from a rooftop to the wet pavement below. It's Archibald McQuinn, the notorious cat burglar, and he's dying. As sirens wail in the distance, Archie manages to get out two last words to his young son, March: "Find jewels." But March learns that his father is not talking about hidden loot. He's talking about Jules, the twin sister March never knew he had. No sooner than the two find each other, they're picked up by the police and sent to the world's worst orphanage. It's not hard time, but it feels like it.

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.

After angering his father, Zeus, the god Apollo is cast down from Olympus. Weak and disoriented, he lands in New York City as a regular teenage boy. Now, without his godly powers, the 4,000-year-old deity must learn to survive in the modern world until he can somehow find a way to regain Zeus' favor. But Apollo has many enemies - gods, monsters, and mortals who would love to see the former Olympian permanently destroyed.

As the son of Hades, Nico di Angelo has been through so much, from the premature deaths of his mother and sister, to being outed against his will, to losing his friend Jason during the trials of Apollo. But there is a ray of sunshine in his life—literally: his boyfriend, Will Solace, the son of Apollo. Together the two demigods can overcome any obstacle or foe. At least, that's been the case so far . . . Now Nico is being plagued by a voice calling out to him from Tartarus, the lowest part of the Underworld.

In Dinosaurs Before Dark, adventure is waiting to happen! Jack and his younger sister, Annie, stumble upon a tree house filled with books. Where did the tree house come from? How long has it been there? When Jack reads a book about the Cretaceous period, 65 million years ago, and wishes he could really see the pteranodon, it suddenly appears at his window. Magically. Before Jack and Annie can figure out the mystery, the tree house whisks them back to the prehistoric past.

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.

Kate craves adventure and excitement. Mia loves dresses, roses, and anything beautiful. Lainey dreams of talking to animals. Gabby believes in fairies more than anyone. In a blink of an eye, these four best friends all get their biggest wish - they're whisked off to Never Land, home to Tinker Bell and her fairy friends. The adventure of a lifetime is just beginning! But how will the Never Girls ever get home again?

Jason has a problem. He doesn't remember anything before waking up on a school bus holding hands with a girl. Apparently she's his girlfriend Piper, his best friend is a kid named Leo, and they're all students in the Wilderness School, a boarding school for "bad kids." What he did to end up here, Jason has no idea—except that everything seems very wrong.

Ana Dakkar is a freshman at Harding-Pencroft Academy, a five-year high school that graduates the best marine scientists, naval warriors, navigators, and underwater explorers in the world. Ana's parents died while on a scientific expedition two years ago, and the only family's she's got left is her older brother, Dev, also a student at HP. Ana's freshman year culminates with the class' weekend trial at sea, the details of which have been kept secret. She only hopes she has what it'll take to succeed.

Fourteen-year-old Ozzy lives near Portland, Oregon, and is desperate for help. His scientist parents have been kidnapped after discovering a formula that enables mind control. Their work was so top secret that Ozzy is afraid to go to the police, but without help, he fears he'll never find his parents. Then he stumbles across a classified ad in the local newspaper that says "Wizard for Hire. Call 555-SPEL." Ozzy has read about wizards in books like Harry Potter, but wizards couldn't exist today, could they? After Ozzy meets the wizard Labyrinth - a.k.a. Rin - he's even more skeptical.

The Impossible Postal Express is no ordinary train. It's a troll-operated delivery service that runs everywhere from ocean-bottom shipwrecks to Trollville and to space. But when this impossible train comes roaring through Suzy's living room, her world turns upside down. After sneaking on board, Suzy suddenly finds herself deputy post master aboard the train and faced with her first delivery - to the evil Lady Crepuscula. Then, the package itself begs Suzy not to deliver him.

Ben Hardy believes he's cursed by potatoes. And now he's moved to Idaho, where the school's mascot is Steve the Spud! Yeah, this cannot be good. After accidentally causing the mascot to sprain an ankle, Ben is sentenced to Spud duty for the final basketball games of the year. But if the other kids know he's the Spud, his plans for popularity are likely to be a big dud! Ben doesn't want to let the team down, so he lies to his friends to keep it a secret. No one will know it's him under the potato suit...right?

Thirteen-year-old Nat Beacon loves a lot of things: her dog Warbucks, her best friend Chloe, and competing on her wheelchair racing team, the Zoomers, to name a few. But there's one thing she's absolutely obsessed with: musicals! From Hamilton to Les Mis, there's not a cast album she hasn't memorized and belted along to. She's never actually been in a musical though, or even seen an actor who uses a wheelchair for mobility on stage. Would someone like Nat ever get cast?

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.

Felix Rannells and Benji Porter were never supposed to be field-trip partners. Felix is a rule follower. Benji is a rule bender. They're not friends. And they don't have anything to talk about. Until...they find a wallet. A wallet that belongs to tech billionaire Laura Friendly. They're totally going to return it - but not before Benji "borrows" 20 dollars to buy hot dogs. Because 20 dollars is like a penny to a billionaire, right?

Seventh grade is not going well for Will Levine. Kids at school bully him because of his funny-looking chin. And for his bar mitzvah community service project, he's forced to go to the hospital to visit RJ, an older boy struggling with an incurable disease. At first, the boys don't get along, but then RJ shares his bucket list with Will. Among the things he wants to do: ride a roller coaster; go to a school dance; swim in the ocean.

When Nic, a slave in the mines outside of Rome, is forced to enter a sealed cavern containing the lost treasures of Julius Caesar, he finds much more than gold and gemstones: He discovers an ancient bulla, an amulet that belonged to the great Caesar and is filled with a magic once reserved for the Gods - magic some Romans would kill for.

Reef and Theo don't know what's happening to them. They'll be going about their days and then suddenly they'll have these strange flashes of memory—but the memories don't belong to them. And at the same time, their own memories are starting to... vanish. For Reef, this is a big problem, because memories are all he has left of his mom. For Theo, it's strange because the new memories give him a freedom he doesn't have with his domineering dad.

Isla and her brother are two young foxes living just outside the lands of the furless - humans. The life of a fox is filled with dangers, but Isla has begun to learn mysterious skills meant to help her survive. Then the unthinkable happens. Returning to her den, Isla finds it set ablaze and surrounded by strange foxes, and her family is nowhere in sight. Forced to flee, she escapes into the cold, gray world of the furless. Now Isla must navigate this bewildering and deadly terrain, all while being hunted by a ruthless enemy.

Calling all Cahills! Announcing a 39 Clues Superspecial adventure - the gang is back, and called to investigate one of their own: Sinead Starling.

Amy and Dan find themselves in a new global race but this time, everything’s different. Those closest to them might be working for the enemy, and Amy and Dan are forced to ask themselves how far they’re willing to go to save the kidnapped Cahills. How much can you risk when there’s no one to trust?

The one thing Nugget, a cute puppy, has ever known to do is love, and his cuteness has always been enough for others to love him back. But when Nugget is put up for adoption, he thinks it's because no one loves him anymore—that he isn't cute anymore. So he does the only thing he can think of: he runs away. Now Nugget is alone on the streets of Boston, where he quickly learns that not everyone is kind. After an unfortunate run-in with another animal leaves him disfigured, he can't rely on his cuteness to get by like he used to.

Trenton Colman is exceptionally creative, with a knack for all things mechanical. But his talents are viewed with suspicion in Cove, a steam-powered city built inside a mountain. In Cove, creativity is a crime, and invention is a curse word.

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

My twin brother is a Wizard and thinks he's the only magician in the family. It's actually a little funny that he hasn't suspected anything different over the last 17 years - with my constantly need to keep his idiot face out of danger and stupidity - but that's not today's problem. You see, someone's trying to kill him.