A lonely boy's new friend has a frightening secret.

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.

Mr. Vane, an orphan and heir to a large house, makes five trips to another world through an old mirror in his house.

While staying with his aunt and uncle, Tom discovers a beautiful garden that is visible only at night and meets a little girl from the Victorian era with whom he travels back in time.

Meg 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.

Bisesa Dutt tries to discover why she was returned to Earth in the year 2037 by the Firstborn amidst the turmoil of an approaching apocalypse.

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.

Ten-year-old August Brown adjusts to his new home in Washington, D.C., with the help of the seven children of Pineapple Place, invisible to everyone but him.

Eleven-year-old cousins Linny and Hilary find themselves transported back to their old Brooklyn neighborhood to a time just before Linny's mother died and Hilary's father left home.

Seventeen-year-old Sky joins Georgia and the other Stravagante when he leaves London for Giglia, a city similar to renaissance Florence, and becomes involved in ancient feuds and palace intrigue.