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.

Meg Murry, her brother Charles, and their friend Calvin, embark on a journey through space and time, assisted by three otherworldly women, when they set out to find Meg's father, a physicist who disappeared while experimenting with time travel.

The fate of the multiverse rests in Marguerite's hands in the final installment of the Firebird trilogy by New York Times bestselling author Claudia Gray. Ever since she used the Firebird, her parent's invention, to cross through alternate dimensions, Marguerite has been at the center of a cross-dimensional feud. Now she has learned that the evil Triad Corporation plans to destroy hundreds of universes, using their ultimate weapon: another dimension's...

When the Time Fetch's foragers gobble up too much time, causing the fabric of the universe to unravel and blur the boundaries between worlds and dimensions, eighth-grade loner Edward and his classmates must band together to save the day.

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.

Rod and his bratty cousin Elspeth are snatched into another dimension by the monstrous alien Smorkus Flinders.

On a vacation with their mother and stepfather, Jane, Mark, Katharine, and Martha find themselves overwhelmed with a lakeful of magical adventures after Mark captures an ancient turtle that seems to have extraordinary powers.

Gottie Oppenheimer, a seventeen-year-old physics prodigy, navigates grief, love, and disruptions in the space-time continuum in one very eventful summer.

When Olive Dunwoody takes her friends trick-or-treating, they're in for a shock--and being follwoed by an ominous creature is only the beginning. Strangers have come to Linden Street, and they seem awfully interested in Olive's house and in portals to Elsewhere. Can Olive trust them? -- from publisher.

In this third book about Omri and his magic cupboard, Omri and his friend Patrick must risk grownups' discovering their secret when they find themselves in need of a friend's toy plastic doctors to save wounded people from the dangerous world of the Old West which the cupboard enables them to enter.