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Twins Theo and Alexander along with their sister Wil are abruptly dropped off at their Aunt Saffronia's house, where they learn they must complete a series of tasks in order to see their parents again, the first of which is solving a mystery at the Fathoms of Fun waterpark.
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Miri is eager to return to her beloved Mount Eskel after a year at the capital, but the king and queen ask her to first journey to a distant swamp and start her own miniature princess academy for three royal cousins, but once there she must solve a mystery before she can return home.
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The shadow of the man in black has followed fourteen-year-old Amy Cahill and her younger brother Dan on their worldwide search for 39 Clues that lead to a great power. The man has tried to kill them and he is a Madrigal, as were their parents. And now the man is ready to step out of the darkness for their final confrontation.
9) Payback
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The clones of Project Osiris go on the run again and this time they are separated. Amber and Malik embark on a dangerous search for mob boss Gus Alabaster, Malik's DNA donor, who can prove the existence of Project Osiris. Eli and Tori try to uncover the project's biggest secret--Eli's DNA donor. Although separated, the four come to realize they will have to work together if they want to end Project Osiris for good.
10) Open if you dare
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Their last summer before going to different middle schools, best friends Birdie, Ally, and Rose follow clues found in a mysterious box labeled Open If You Dare.
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"Harley Quinn loves fighting crime with her classmates like Wonder Woman, Batgirl, and Supergirl, but she always does it her with own madcap style--and a big mallet! It's no surprise that Harley can't resist getting involved with an upcoming inter-school battle of the bands and a fantastic cosmic carnival that appears only once a year--and this year, it's coming to Earth! But as things get stranger, Harley knows how to get to the bottom of a mystery--and...
14) The real McCoys
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Elementary school detective Moxie McCoy looks for a missing school mascot and a new best friend, with the help of her annoying little brother.
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"When best friends Abbi and Skylar witness a clandestine meeting between a mysterious woman and someone in a dark van, they're thrilled. Finally, a mystery to spice up the summer! Who could these people be? Why are they meeting? Are they spies? Criminals? The two girls are determined to find out. But then a local woman goes missing and is found dead in the woods. And Abbi and Skylar realize that their detective work could hold the keys to solving...
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"Six months ago, Mars Patel boarded a spaceship to travel to Oliver Pruitt's colony on the planet Mars, and now he's finally there. The journey gave Mars lots of time to bond with his copilots, but Mars and his new friends soon discover that Pruitt's colonists aren't the only people living on the inhospitable planet. A splinter group, led by the mysterious Fang, are desperate to go back to Earth--and they don't care who they hurt in the process. Amid...
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Returning to Earth after escaping the Martian colony, Mars Patel and his friends, along with genius billionaire Oliver Pruitt, discover that all the adults have mysteriously vanished and, as tensions rise and new mysteries are revealed, must somehow discover the truth.
20) Unmasked
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When fourteen-year-old Marion's latest mask creation, Winston, comes to life and possesses her crush, Tyler, turning him into a red-flannel and Converse high-top wearing creature from Connecticut, she must find a way stop the monster or risk it staying forever.