A thrilling new series about the world’s youngest and smartest genius who’s forced to use her unbelievable code-breaking skills to outsmart Einstein. 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. In a breakneck adventure that spans the globe, Charlie must crack a complex code created by Einstein himself, struggle to survive in a world where no one can be trusted, and fight to keep the last equation safe once and for all.

“Fast-paced, smart, and action-packed...a real page-burner.” —Chris Grabenstein, #1 New York Times bestelling author of the Mr. Lemoncello’s Library series From New York Times bestselling author Stuart Gibbs comes the first novel in a thrilling new series about the world’s youngest and smartest genius who’s forced to use her unbelievable code-breaking skills to outsmart Einstein. 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. In a breakneck adventure that spans the globe, Charlie must crack a complex code created by Einstein himself, struggle to survive in a world where no one can be trusted, and fight to keep the last equation safe once and for all.

In this sequel to the New York Times bestselling Charlie Thorne and the Last Equation—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—Charlie searches for Charles Darwin’s hidden treasure in South America. Charlie Thorne is a genius. Charlie Thorne is a fugitive. Charlie Thorne isn’t even thirteen. After saving the world, Charlie is ready to take it easy in the Galapagos Islands. That is, until she’s approached by the mysterious Esmeralda Castle, who has a code she knows only Charlie can decipher. In 1835, Charles Darwin diverted his ship’s journey so he could spend ten months in South America on a secret solo expedition. When he returned, he carried a treasure that inspired both awe and terror in his crew. Afterward, it vanished, never to be seen again… But Darwin left a trail of clues behind for those brave and clever enough to search for it. Enter Charlie Thorne. In a daring adventure that takes her across South America, Charlie must crack Darwin’s 200-year-old clues to track down his mysterious discovery—and stay ahead of the formidable lineup of enemies who are hot on her tail. When an ancient hidden treasure is at stake, people will do anything to find it first. Charlie may be a genius, but is she smart enough to know who she can trust?

In this sequel to the New York Times bestselling Charlie Thorne and the Last Equation—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—Charlie searches for Charles Darwin’s hidden treasure in South America. Charlie Thorne is a genius. Charlie Thorne is a fugitive. Charlie Thorne isn’t even thirteen. After saving the world, Charlie is ready to take it easy in the Galapagos Islands. That is, until she’s approached by the mysterious Esmeralda Castle, who has a code she knows only Charlie can decipher. In 1835, Charles Darwin diverted his ship’s journey so he could spend ten months in South America on a secret solo expedition. When he returned, he carried a treasure that inspired both awe and terror in his crew. Afterward, it vanished, never to be seen again… But Darwin left a trail of clues behind for those brave and clever enough to search for it. Enter Charlie Thorne. In a daring adventure that takes her across South America, Charlie must crack Darwin’s 200-year-old clues to track down his mysterious discovery—and stay ahead of the formidable lineup of enemies who are hot on her tail. When an ancient hidden treasure is at stake, people will do anything to find it first. Charlie may be a genius, but is she smart enough to know who she can trust?

In this third book in the Charlie Thorne series from bestselling author Stuart Gibbs, Charlie tracks down Cleopatra’s greatest treasure in Egypt. 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. In 30 BCE, Cleopatra and her husband, Marc Antony, lost their war against Octavian for control of the Egyptian Empire. However, Cleopatra knew Octavian was really after the mysterious item that was the source of all her wealth and influence, so she hid it before dying by suicide. She left a series of devious clues behind for her children to find it, but they were lost to history…until now. In a breathless adventure that takes her across the globe, Charlie must fight for her life against ruthless enemies, match wits with Cleopatra, and solve the two-thousand-year-old mystery to prevent the most powerful treasure of the ancient world from falling into the wrong hands.

In the fourth installment of the New York Times bestselling Charlie Thorne series—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—Charlie searches for Isaac Newton's secret treasure across Europe and Australia. Charlie Thorne is a genius. Charlie Thorne is fearless. Charlie Thorne may have finally met her match. Charlie Thorne is used to being on the run. Ever since she was recruited by the CIA to track down Einstein’s most dangerous equation, Charlie—and former CIA agents Dante Garcia and Milana Moon—have traveled around the world to prevent history’s greatest discoveries from falling into the wrong hands. But after beating others to the secrets hidden by Einstein, Darwin, and Cleopatra, they find they are not the only ones searching for an immensely powerful discovery of Isaac Newton’s. From a chase over the rooftops of Cambridge University to scaling the Sydney Harbour Bridge to skirting a volcanic eruption, Charlie will need to think one step ahead of her opponents to follow Newton’s trail of devious clues and keep herself out of the hands of the many enemies who are hot on her tail.

The Charlie Thorne series—which #1 New York Times bestselling author Chris Grabenstein called “a real page-burner”—is now available in a paperback boxed set! 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. Charlie Thorne is not your average twelve-year-old. Brilliant, adventurous, and defiant, she has been forced to help track down and protect the greatest hidden secrets of mankind: an incredibly dangerous equation devised by Einstein, an astonishing discovery by Darwin, and the mysterious source of Cleopatra’s power. To find each one, Charlie must travel the world, facing danger at every turn, cracking codes, solving mysteries, and struggling to stay ahead of the formidable lineup of enemies and government agents who are hot on her tail. This code-cracking paperback boxed set includes: Charlie Thorne and the Last Equation Charlie Thorne and the Lost City Charlie Thorne and the Curse of Cleopatra

After being expelled from spy school, twelve-year-old Ben Ripley accepts an offter to join evil crime organization SPYDER, and although he knows he is a key part of their sinister plan he is not sure how to get word to the good guys without being caught.

After being expelled from spy school, twelve-year-old Ben Ripley accepts an offter to join evil crime organization SPYDER, and although he knows he is a key part of their sinister plan he is not sure how to get word to the good guys without being caught.

Twelve-year-old Theodore “Teddy” Roosevelt Fitzroy has murder on his hands and trouble on his tail. He 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!

Twelve-year-old Teddy Fitzroy is the prime suspect when FunJungle's newly-acquired koala goes missing, thanks to a prank staged by middle school bully Vance Jessup.

Teddy Fitzroy’s back for another zoo mystery—this time it’s a koala caper—in this action-packed follow-up to Belly Up that School Library Journal called a “whopper of a whodunit that delivers plenty of suspects, action, slapstick, gross bodily functions, red herrings, and animal trivia.” School troublemaker Vance Jessup thinks Teddy Fitzroy’s home at FunJungle, a state-of-the-art zoo and theme park, is the perfect place for a cruel prank. Vance bullies Teddy into his scheme, but the plan goes terribly awry. Teddy sneaks into the koala exhibit to hide out until the chaos dies down. But when the koala goes missing, Teddy is the only person caught on camera entering and exiting the exhibit. Teddy didn’t commit the crime—but if he can’t find the real culprit, he’ll be sent to juvie as a convicted koala-napper.

When someone takes aim at Rhonda Rhino, FunJungle s pregnant (and endangered) Asian greater one-horned rhinoceros, the zoo steps up security measures in order to protect this rare animal and her baby. But the extra security isn t enough someone is still getting too close for comfort. Teddy and company start to suspect that whoever is after Rhonda is really after her horn, which is worth a lot of money on the black market. For the first time ever, the head of the zoo enlists Teddy for help for once, he doesn t have to sneak around in order to investigate and the results are even more wacky, and even more dangerous, than ever before.

Teddy Fitzroy returns as FunJungle’s resident zoo sleuth when a rhinoceros is at risk in Big Game, a follow-up to Belly Up and Poached—which Kirkus Reviews called a “thrill-ride of a mystery.” When someone takes aim at Rhonda Rhino, FunJungle’s pregnant (and endangered) Asian greater one-horned rhinoceros, the zoo steps up security measures in order to protect this rare animal and her baby. But the extra security isn’t enough—someone is still getting too close for comfort. Teddy and company start to suspect that whoever is after Rhonda is really after her horn, which is worth a lot of money on the black market. For the first time ever, the head of the zoo enlists Teddy for help—for once, he doesn’t have to sneak around in order to investigate—and the results are even more wacky, and even more dangerous, than ever before.

New York Times bestselling author Teddy Fitzroy returns as FunJungle’s resident sleuth when the zoo’s newest addition goes missing—before she even arrives!—in the latest novel in New York Times bestselling author Stuart Gibbs’s FunJungle series. FunJungle is frenzied, awaiting the arrival of its most thrilling animal yet—Li Ping—a rare and very expensive giant panda that the zoo went to enormous lengths to secure. But when the truck transporting Li Ping shows up, its precious cargo has vanished into thin air. The FBI steps in to investigate, and Teddy is happy to leave the job in their (supposedly) capable hands. After all, FunJungle has never encountered a crime this serious. But when someone threatens to blackmail Teddy’s girlfriend, Summer, if he doesn’t solve the crime, his involvement in this mystery is no longer black and white.

Teddy Fitzroy returns as FunJungle’s resident sleuth when a lion is falsely accused of killing a distinguished dog in the latest novel in New York Times bestselling author Stuart Gibbs’s FunJungle series. For once, operations at the enormous zoo/theme park appear to be running smoothly (except for the occasional herring-related mishap in the penguin exhibit) and Teddy Fitzroy is finally able to give detective work a rest. But then a local lion is accused of killing a famous dog—and the dog’s owner, an inflammatory radio host, goes on a crusade to have the cat declared a nuisance so it can be hunted. But it looks like the lion might have been framed, and a renegade animal activist wants Teddy and Summer to help prove it. Soon, Teddy finds himself wrapped up in the middle of his most bizarre, hilarious, and dangerous case yet.

Teddy Fitzroy returns as FunJungle’s resident sleuth when a lion is falsely accused of killing a distinguished dog in the latest novel in New York Times bestselling author Stuart Gibbs’s FunJungle series. For once, operations at the enormous zoo/theme park appear to be running smoothly (except for the occasional herring-related mishap in the penguin exhibit) and Teddy Fitzroy is finally able to give detective work a rest. But then a local lion is accused of killing a famous dog—and the dog’s owner, an inflammatory radio host, goes on a crusade to have the cat declared a nuisance so it can be hunted. But it looks like the lion might have been framed, and a renegade animal activist wants Teddy and Summer to help prove it. Soon, Teddy finds himself wrapped up in the middle of his most bizarre, hilarious, and dangerous case yet.

The local police prove unhelpful when a 500-pound dinosaur skull vanishes from a secret excavation on Sage's family's ranch, so Teddy and his friends conduct their own investigation.