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Seeking to prove her father is not a mad conspiracy theorist, Gillian Seagret, her brother Eric, best friend Savannah, and NASA-obsessed schoolmate Howard uncover the secret doomsday bunker of Dr.

"Mia and her friends resurface at the well's end to discover an astounding underground civilization, and immediately find themselves drawn into a terrible civil war"--Provided by publisher.

Twelve-year-old Merryn's father disappears one night after a fishing expedition, and her vision that he's been dragged underwater only leads her to build a tiny submarine and explore the undersea world in order to find him.

Neglected by her father, who spends all of his time building the ghost machine to bring her mother back from the dead, twelve-year-old Emmaline decides that the only way to bring her father back will be to make the ghost machine work, or destroy it forever.

"In a world where people are implanted with technology to recode their DNA, gene-hacking genius Cat must decrypt her late father's message concealing a vaccine to a horrifying plague"--Provided by publisher.

In a world that is rapidly descending into chaos, Frey and Rafi are twin sisters, but few people know of Frey's existence, because she has been raised to be her sister's body double and lethal bodyguard, while Rafi has been raised to further the family's political power--but when their father sends Frey in her sister's place as collateral in a tricky deal, Col, the son of a rival leader, gets close enough to begin to suspect something, and Frey must decide whether to deal with him violently or finally assume her own identity.

"Rory and her father have survived the antibiotic crisis that has killed millions, including Rory's mother--but ingenuity and perseverance aren't their only advantages.

"For seventeen-year-old Opal Hopper, code is magic. She builds entire worlds from scratch: Mars craters, shimmering lakes, any virtual experience her heart desires.

"When the world sees Frey, they think they see her twin sister Rafi.

"Teenaged Leyla McQueen, who lives beneath the ruins of a submerged London in 2099, joins a prestigious submersible race in the hope of clearing her father's name before encountering government corruption and a hidden world"--OCLC.

"Hoping to restore her father's good name and job, Maggie teams up with friend Nate to win a junior naturalist contest, but the rare bioluminescent fungus they find is big trouble.

"Raised to be her twin sister Rafi's body double and bodyguard, but now with new face and body Frey and her lover Col are determined to return to Shreve to rescue Boss X, a friend and ally in the rebellion of the free cities against people like Frey's father, ruthless ruler of Shreve; but Frey is troubled by things even beyond the dangers of her mission--confusion over her own identity, guilt over having killed her brother (even if he was trying to kill Rafi at the time), and worry about whether her sister, who has stolen Frey's name and identity, can be trusted with the fate of Shreve"--OCLC.

"In a post-apocalyptic future, teenaged Leyla feels compelled to search for Ari, while seeking to uncover the mystery behind her past"--OCLC.

When the arrival of Eduardo Lizalde sets in motion a dangerous chain of events, Carlota Moreau finds her carefully constructed world falling down around her as passion is ignited in the sweltering heat of the jungle where a motley group of monstrosities await.

Years after a major earthquake in Japan creates different zones in which time passes differently, Sora and her father secretly investigate the off-limit zones in order to find the answer behind the time anomalies and the disappearance of Sora's mother.