space and time

With his grandmother's new invention, the Anti-Boredom Machine, twelve-year-old Kieran finds that he can speed up time or travel back into the past, but this ability soon creates more problems than it solves.

When his spaceship crashes to earth, a highly advanced alien interferes with the lives of two teenagers living on the island of Manhattan during different centuries.

Tolly comes to live with his great-grandmother at the ancient house of Green Knowe and becomes friends with three children who lived there in the seventeenth century.

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.

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.

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.

With Saint Dane seemingly on the verge of toppling all of the territories, Pendragon and Courtney set out to rescue Mark and find themselves traveling--and battling--their way through different worlds as they try to save all of Halla.

Fifteen-year-old Bobby Pendragon places himself, his friends, and the people of Halla in danger in order to protect the territories from a mysterious plague.

The demonic Saint Dane attempts to take over Loor's home planet of Zadaa, opposed once again by the teenaged Pendragon and other Travelers.

The new boy at school introduces Amy to the secrets of Stone Hollow, where the circles of time converge.