The past, present, and future are all at stake in this final book in the thrilling time travel adventure trilogy from New York Times bestselling author Stuart Gibbs.

Greg Rich should feel invincible. After all, he's traveled through time, become one of the legendary Musketeers, and—most recently—prevented the Spanish army from attacking Paris.

Instead, he and his friends are languishing in prison, having

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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...

AGENTE: Ben Ripley, 12 años MISIÓN: Sobrevivir a su nuevo instituto que es, en realidad, una tapadera para formar a los agentes júnior de la CIA. DESTRUYE ESTA NOTA DESPUÉS DE MEMORIZARLA. Ben Ripley todavía va al instituto, pero tiene claro su futuro: espía de la CIA o nada. Así que cuando finalmente la CIA lo recluta para su Academia de Espionaje supersecreta, Ben no podría ser más feliz. Hasta que descubre la verdad: Ben es solo el cebo...

Loyalty is tested in this second book in the thrilling time travel adventure trilogy from New York Times bestselling 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

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While visiting a ranch near Yellowstone National Park with his parents, Summer, and her parents, Teddy Fitzroy investigates the disappearances of bison and an irreplaceable necklace.

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...

"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...

In 2041 twelve-year-old Dashiell Gibson is a resident of Moon Base Alpha, and at the moment he is faced with a number of problems: coping with the nasty Sjoberg twins, finding out how the commander of the base has managed to disappear from a facility no bigger than a soccer field, and dealing with the alien Zan who communicates with him telepathically from afar--and who is hiding a secret which may threaten the whole Earth.

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.

As almost thirteen-year-old Ben, a student at the CIA's academy for future intelligence agents, prepares to go to spy summer camp, he receives a death threat from the evil organization SPYDER.