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As her mother prepares to be a contestant on the 1980s television game show, "The $20,000 Pyramid," a twelve-year-old New York City girl tries to make sense of a series of mysterious notes received from an anonymous source that seems to defy the laws of time and space.

When someone uses futuristic technology to play pranks on twelve-year-old Dorso Clayman, he and his best friend set off on a supposedly impossible journey through space and time trying to stop the gamesters who are endangering the universe.

The magic tree house whisks Jack and Annie away to Australia where they must save some animals from a wildfire.

Meg Murry and her friends become involved with unearthly strangers and a search for Meg's father, who has disappeared while engaged in secret work for the government.

Each of the Travelers returns home to learn the truth about their origins before being reunited for a final, inevitable confrontation with Saint Dane, whose efforts to control Halla are destroying its very foundations.

Teenaged criminal mastermind Artemis Fowl must save the underwater fairy metropolis of Atlantis from danger, while battling a psychological affliction known as the Atlantis Complex.

At nearly fifteen years of age, Joey Harker learns that he is a Walker, able to travel between dimensions, and soon joins a team of different versions of himself, each from another dimension, to fight the evil forces striving to conquer all the worlds.

How can tomorrow ever be as good as yesterday? Boy doesn't think it can be and puts all his scientific knowledge to use, trying to work out how to go faster than the speed of light and make time go backwards. His grandad discovers him exploring the garden looking for wormholes, a possible shortcut back to yesterday - and reassures him that tomorrow will hold great experiences, which will become new treasured memories.

"Margo is a troubled schoolgirl. After the death of her father, she's on her way to a new boarding school in a new city. They never should have met. But when Margo suddenly appears one day on Moon's train, their fates become inextricably linked. If Margo wants to survive, she has to pass as a traveling salesman, too--except it's not that easy. Move north on the train line and time speeds up, a day passing in mere hours. Move south and time slows down--a...

Fifteen years after Billy and Bonnie Bannister helped expel the demonic assault on heaven, they and Ashley Foley are in a maximum security prison where the authorities conduct experiments on them to learn the secrets of long life. Meanwhile, an ancient demon locates the Bannister's daughter and plans to use her to find and control the most powerful ovulum in the world. The fate of two worlds now rests on the Bannisters' two teenagers who must use...