Loyalty is tested in this second book in the thrilling time travel adventure trilogy from New York Times bestselling Charlie Thorne and Spy School author Stuart Gibbs. Having assumed the identity of a young D’Artagnan, Greg Rich is beginning to get the hang of things in 1615 Paris. But he hasn’t figured out how to get home yet. Or how to defeat the dangerous Michel Dinicoeur, who has made it his mission to destroy Greg, Athos, Aramis, and Porthos. When Dinicoeur escapes the Bastille and flees to Spain, the Musketeers charge after him, only to be ambushed. Someone is anticipating their every move. Could there be a traitor in their midst? If the Musketeers can’t trust each other, who can they trust? It’s “all for one and one for all” . . . isn’t it? And don’t miss the action-packed finale, The Last Musketeer #3: Double Cross.

The first book in the thrilling time travel adventure trilogy from New York Times bestselling Charlie Thorne and Spy School author Stuart Gibbs. Before they were legends, they were friends. All for one and one for all! 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 fourteen-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. To rescue his parents, Greg must assume the identity of a young Musketeer in training and unite Athos, Porthos, and Aramis—but a powerful enemy is doing everything possible to stop him. And don't miss Traitor's Chase and Double Cross, the next two books in Stuart Gibbs's thrilling Last Musketeer trilogy!

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 2041 on Moon Base Alpha, thirteen-year-old Dash must solve the mystery of how Lars was poisoned before the base loses oxygen, forcing the colonists to return to Earth.--Provided by publisher.

"Superspy middle schooler Ben Ripley races against time and across state lines - traveling by car, train, boat and plane - to track Murray Hill down before Ben's cyber enemies can find him"--

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 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.