space and time

Twelve-year-old Henry York and his cousin Henrietta discover 100 hidden portals to other worlds in the bedroom wall of his aunt and uncle's house.

When twelve-year-old Becker Drane is recruited by The Seems, a parallel universe that runs everything in The World, he must fix a disastrous glitch in the Department of Sleep that threatens everyone's ability to ever fall asleep again.

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.

Jonah, Katherine, Chip, and Alex find themselves in 1483 at the Tower of London, and discover that Chip and Alex are Prince Edward V and Richard of Shrewsbury, imprisoned by Richard III; but trying to repair history without knowing what is supposed to happen proves challenging.

The fifteen-year-old Murry twins, Sandy and Dennys, are accidentally sent back to a strange Biblical time period, in which mythical beasts roam the desert and a man named Noah is building a boat in preparation for a great flood.

Twelve-year-old Matthew is drawn almost against his will to help a boy his own age who was lost in a mining disaster a century before.

Fourteen-year-old Jason Walker is transported to a strange world called Lyrian, where he joins Rachel and a few rebels to piece together the Word that can destroy the malicious wizard emperor, Surroth.

A pampered young black girl who has been mysteriously transported back to the days of slavery, struggles to escape her bondage.

The Time Surfers are in a race against Zoa, a slimy dronth, to be the first to find the photon crystal, which allows those that possess it the power to change the present, future, and even the past.

During Daniel's summer visit with his grandmother in York County, Pennsylvania, characters and events from his visit to York, England, appear and reappear in mysterious ways. Sequel to Shadows on the Wall.