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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.

Just after Cassie Arroyo found the Spear of Destiny in Rome, it was stolen from her, so now she and her friend Asher must recover it--but when she used the Spear before, she set the world down a dangerous path, and if she recovers it she will have to decide whether to risk using it again.

This time Cleo, Evan, and Ms. Crowley (who, it turns out, is the missing Ms.

Twelve-year-old Addison Cook and his friends are on the hunt for a long-lost treasure.

Ronan Boyle is the youngest and lowest recruit into the secret garda, an Irish police force that tries to stem and stop the misdeeds of unnumbered magical creatures.

Aspiring Professional Adventurer Mr. Penguin, his colleague, Colin the spider, and friends Edith and Gordon crash-land on a snowy mountain where they face an evil hypnotist and seek missing pets.

"Cruz Coronado sets sail for the shores of Iceland and Norway aboard the Explorer Academy ship to continue his studies at sea.

"A mysterious person alerts Cruz to impending danger while he and a few trusted pals explore ancient ruins in Petra, Jordan, and search for another piece of the puzzle his mother left behind.

"It was only a few days ago that Tess Biedermann, Theo Biedermann, and Jaime Cruz, along with a mysterious figure from the past, managed to survive an assault on the locationof the latest clue in the Morningstarr cipher -- and, in theprocess, made a shocking discovery about their own connection to this one-hundred-sixty-year-old enigma.

"Mr. Penguin and his Adventuring gang board a luxury cruise ship for some much-needed rest and a little entertainment.

"For centuries, the magnificent Throne of Felipe has stood with two empty spaces beside its famous silver arrow'spaces where the silver castle and lion should have been.

In 1666, after four months away, friends Christopher Rowe, Tom, and Sally return to London triumphantly but, guided by coded riddles, face a conspiracy that threatens Christopher, as well as the King himself.

Budding archeologist Addison Cooke receives a mysterious package that draws the attention of criminals and fortune-hunters from all over the world.

When Addison's aunt and uncle become pawns in a dangerous gang's plan to steal Genghis Khan's most prized possession, Addison and his friends find themselves in the middle of a multi-million dollar heist and must travel across Asia to try and rescue Addison's family and stop the treasure from falling into the wrong hands.

"On an island nation in the Indian Ocean, the explorers venture through a vast underwater world and take part in a friendly robotics competition.