"Stephen Hawking's worldwide bestseller, A Brief History of Time, has been a landmark volume in scientific writing. Its author's engaging voice is one reason, and the compelling subjects he addresses is another: the nature of space and time, the role of God in creation, the history and future of the universe. But it is also true that in the years since its publication, readers have repeatedly told Professor Hawking of their great difficulty in understanding...

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 eighteen-year-old Marguerite Caine's father is killed, she must leap into different dimensions and versions of herself to catch her father's killer and avenge his murder"--

When young Elana unexpectedly joins the team leaving the spaceship to study the planet Andrecia, she becomes an integral part of an adventure involving three very different civilizations, each one centered on the third planet from the star in its own solar system.

Spending the summer marooned with her mother and stepfather in a snooty Massachusetts shore town bores Cassandra until she meets a dreamy stranger who claims the year is 1925, sweeping Cassandra into a mystery a hundred years in the making.

When her best friend, Libby, misuses instant transportation technology to alter her appearance, seventeen-year-old Clair is drawn into a shadowy world of conspiracies and cover-ups as she attempts to save Libby from the hidden consequences of her actions.

When Kit Livingstone learns that Britain's "ley lines" are not legends but pathways to other worlds, he's determined to find a map tattooed on a piece of skin in order to travel to the dangerous realms. But are the intricate codes more than they seem--can they really begin a quest to regain paradise?

Josie Byrne's life is spiraling out of control. Her parents are divorcing, her boyfriend Nick has grown distant, and her physics teacher has it in for her. When she's betrayed by the two people she trusts most, Josie thinks things can't get worse. Until she starts having dreams about a girl named Jo. Every night at the same time -- 3:59 a.m. Jo's life is everything Josie wants: she's popular, her parents are happily married, and Nick adores her. It...

Eighth-grader Orithian "Rith" Haley discovers another world via the staircase in his house and begins to explore questions about God and about the father he never knew.

Scott Graham has been sent from another world to Marus to fulfill the purposes of the Unseen One. In this bizarre world, time has stopped. In fact everything has stopped. Draven, the prophet, has orchestrated the entire phenomenon to prove the Unseen One is the true God. Now, Marus' corrupt monarch and his idolatrous wife has challenged Draven to a showdown. The challenge: to restart time. If the evil queen has her way, both the prophet and Scott,...