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The desert is no place for ocean-dwelling Kampii like Aluna and Hoku, especially now that Aluna has secretly started growing her tail. But the maniacal Karl Strand is out to conquer the Above World, and the horselike Equians are next on his list. Aluna, Hoku, and their friends - winged Calli and Equian exile Dash - race to the desert city of Mirage, intent on warning the Equians and forming an alliance. Unfortunately, Strand’s clone, Scorch, has gotten there first. Now the Equian leader has vowed to take all his people to war as part of Strand’s army.

Jack and Annie are whisked back to the Civil War, where they meet Clara Barton and save the life of their very own great-great-great-grand-father.

Jack and Annie are whisked all the way back to the Ice Age in this compelling Magic Tree House time-travel adventure, in which they meet woolly mammoths, cave people...and fierce sabertooth tigers!

The Magic Tree House whisks Jack and Annie away to the decks of that ill-fated ship, the Titanic. There, they must help two children find their way to a lifeboat, all while they are in danger of becoming victims of that tragic night themselves.

Thirteen-year-old Aluna has lived her entire life under the ocean, just like all of the Coral Kampii in the City of Shifting Tides. But after remaining hidden from the Above World for centuries, her colony is in trouble, its survival in doubt :  the tech that allows the Kampii to breathe underwater is beginning to fail, and many Kampii have already died. Yet the colony’s elders, including Aluna’s father, are unwilling to venture to the dry and dangerous Above World to search for answers. So it’s up to Aluna and her friend Hoku to face the terrors of land to find a solution.

A thrilling sequel to Ted Bell's New York Times best seller Nick of Time, in which the young time traveler Nick McIver must prove his courage once more, on two fronts: in World War Two-era England, where Nazis have invaded his homeland, and in America during the Revolution, where Nick stands shoulder to shoulder with General George Washington.

First Aleks' mom loses the car keys, which he finds in the fridge, and then Christoffer forgets how to get to his own house. On the surface it doesn't seem so bad, but events become more disturbing as the day progresses. Something strange is happening in Norway, and Aleks Mickelsen is the only one who can stop it. Too bad for us, the last thing he wants is another adventure.

Noah, his sister Megan, and their best friends, Richie and Ella, live next door to the zoo. Megan is the first to notice the puzzling behavior of some of the animals. One day Megan disappears, and her brother and their friends realize it’s up to them to find her. Their only choice is to follow a series of clues and sneak into the zoo. But once inside, will they discover there’s much more to the Clarksville City Zoo than they could ever have guessed?

In New York Times best-selling author Dan Gutman's all-new series, which blends fascinating real history with an action-packed and hilarious adventure, four very different kids are picked by a mysterious billionaire to travel through time and photograph some of history's most important events. This time the four friends are headed to 1863 to catch Abraham Lincoln delivering his famous Gettysburg Address.

Supervillains do not merely play hooky. True, coming back to school after a month spent fighting - and defeating - adult superheroes is a bit of a comedown for the Inscrutable Machine. When offered the chance to skip school in the most dramatic way possible, Penelope Akk can't resist. With the help of a giant spider and mysterious red goo, she builds a spaceship and flies to Jupiter. Penny and her friends find all this and more on Jupiter's moons, but what they don't find are any heroes to save the day.

It's summertime for supervillains! Or maybe not, because for Penelope Akk, there is still one foe she has yet to defeat: her own reputation as Bad Penny. It's been a fun ride: fighting adult heroes, going to space, and inspiring the rest of her school to open up about their own powers. Sooner or later, that ride has to end, and with school out of the way Penny is hatching a mad scheme to end it on her own terms. Will that go smoothly? Of course not. Penny's left too many unsolved problems behind her already, like ghosts, crazy friends, and angry little girls from Jupiter.

What would middle school be like if half your classmates had super powers? It's time for Penny Akk to find out. Her latest (failed) attempt to become a superhero has inspired the rest of the kids in her school to reveal their own powers. Now, all of her relationships are changing. She has a not-at-all-secret admirer, who wants to be Penny's partner almost as much as she wants to be Penny's rival. The meanest girl in school has gained super powers and lost her mind. Can Penny help her find a better one?

Penelope Akk wants to be a superhero. She's got superhero parents. She's got the ultimate mad science power, filling her life with crazy gadgets that even she doesn't understand. She has two superpowered best friends. In middle school the line between good and evil looks clear. In real life nothing is that clear. All it takes is one hero's sidekick picking a fight, and Penny and her friends are labeled supervillains. In the process Penny learns a hard lesson about villainy: She's good at it.

Chipper is a very special dog. As part of a top-secret multimillion-dollar experiment to create the ultimate canine spy technology, Chipper's whole life has been spent within the walls of a secret organization known only as The Institute. Chipper is supposed to be more machine than mutt, but something's wrong, and The Institute knows it. He's about to be terminated. Across the state, 12-year-old orphan Jeff Conway is working all hours at his aunt Flo's lakeside cabin business. He misses his parents, his old life, and the dog he had to leave behind.

This story begins after King Uhla'ar kidnapped Aly and dragged her back through a rift in time. A giant, merciless behemoth guards the opening, and so Jack McKinley and his friends realize that rescuing Aly will be harder than they thought. Their only hope is to rush to the last of the Ancient Wonders and find the rest of the lost Loculi.

In a world filled with Bugs - monsters that ceaselessly ravage the Earth - Milo Silk has a hard time keeping his dreams separate from reality. So he keeps them locked up in his dream journal and hopes they'll never come to pass. But too often they do - like when his father disappeared three years ago. Lately the Witch of the World has been haunting his dreams, saying he is destined to be the hero who saves everyone.

In the future, Cosmo Hill breaks out of an orphanage with the help of the Supernaturalists, a motley crew of kids who all have the same special ability as Cosmo: they can see supernatural Parasites, creatures that feed on the life force of humans. The Supernaturalists patrol the city at night, hunting the Parasites in hopes of saving what is left of humanity in Satellite City. Or so they think. The Supernaturalists soon find themselves caught in a web far more complicated than they imagined

After traveling through history multiple times and finding out his original identity, Jonah thought he'd fixed everything. But some of his actions left unexpected consequences. His parents - and many other adults - are still stuck as teenagers. And now Jonah has a new sibling, an identical twin brother named Jordan. As odd as all this is for Jonah, it's beyond confusing for Jordan. How does everyone in his family have memories of Jonah when he doesn't?

Jack, his genius siblings Ava and Matt, and inventor Dr. Hank Witherspoon travel to the Hawaiian island home of Ashley Hawking, a technology billionaire. Hawking and engineer Rosa Morris have built a revolutionary electricity plant that harvests energy from the deep ocean, but someone has been sabotaging the project. In their search for the culprit, Jack and crew navigate an unusual world of characters and suspects, including Hawking and her obnoxiously intelligent son.

Mori and her friends live a normal life on Firefly Lane in their utopian community, Old Harmonie. In a world this safe and perfect, they've never had to question anything...never had to wonder about how their lives came to be. Until a new girl named Ilana moves in. She's so perfect that Mori and her friends are curious.... Where exactly did Ilana come from, and why does she act so strange sometimes? When Ilana's secret is revealed, the kids on Firefly Lane must decide: Is it finally time to start questioning the only world they've ever known?