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 members of the club and their new friend Rose travel through the mirror in the magic attic, they become trapped in a natural history museum.

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.

When Arthur is drafted into the Glorious Army of the Architect by Sir Thursday, he must survive basic training, avoid getting posted to the Front, and figure out how to free Part Four of the Will, while Leaf tries to banish Arthur's doppleganger on Earth.

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.

"All it takes is one hit on the football field, and suddenly Ash's life doesn't look quite the way he remembers it. Impossible though it seems, he's been hit into another dimension--and keeps on bouncing through worlds that are almost-but-not-really his own. The changes start small, but they quickly spiral out of control as Ash slides into universes where he has everything he's ever wanted, universes where society is stuck in the past...universes...

Paragor unites with the Wyrm Lord and the Seven Sleepers to launch an assault on the kingdom of Alleble and its allies, who face the coming onslaught believing that they will be victorious with the help of the Three Witnesses.

"In a far distant future, Tucker Feye and the inscrutable Lia find themselves atop a crumbling pyramid in an abandoned city. In present-day Hopewell, Tucker's uncle Kosh faces armed resistance and painful memories as he attempts to help a terrorized woman named Emma, who is being held captive by a violent man. And on a train platform in 1997, a seventeen-year-old Kosh is given an instruction that will change his life, and the lives of others, forever....

After mastering the ability to walk between dimensions, sixteen-year-old Joey Harker and his fellow InterWorld freedom fighters embark on a mission to maintain peace between the rival powers of magic and science who seek to control all worlds.