Diane Duane

Teenage wizard Nita travels to other universes to find a cure for her mother who has brain cancer.

Thirteen-year-old Nita, tormented by a gang of bullies because she won't fight back, finds the help she needs in a library book on wizardry which guides her into another dimension.

When her younger sister uses the family computer with its special wizard software to travel to worlds light years away, Nita uses her wizardry to try to find her.

Nita and Kit rejoin forces when a strange darkness of the mind overcomes the older wizards, stealing away their power, and forcing the younger wizards to go to war to save the world.

Young wizards Kit Rodriguez and Nita Callahan manage to wangle their way onto an elite team sent to investigate the mysterious, long-sought "message in a bottle" that holds the first clues to the secrets of the ancient Martian race.

Set in the universe of Star Trek: The Next Generation, a doorway is opened from another universe and the crew of the U.S.S Enterprise must battle their toughest enemy yet—themselves.
One hundred years ago, four crewmembers of the U.S.S EnterpriseTM crossed the dimensional barrier and found a mirror image of their own universe, populated by nightmare duplicates of their shipmates. Barely able to escape...

An investigation into a simple cellular-phone fraud leads both Peter Parker and his alter-ego, the Amazing Spider-Man, to a fiendish plot: using unique counterfeiting equipment and a devastatingly large stock-pile of bombs, someone plans to destabilize the world's economy and destroy several major cities. The mysterious corporation CCRC is involved in this plan—and they have caused trouble in the past for Spider-Man and for the alien symbiote...

In an increasingly wired and computer-friendly world, massive multiplayer online games have become the ultimate form of entertainment. And the most popular gaming universe of all is Omnitopia, created by genius programmer Dev Logan. For millions of people around the world, Omnitopia is an obsession, a passionate pastime, almost a way of life. But there's a secret to Omnitopia, one that Dev would give his life to protect-the game isn't just a program...

Nita is just looking for an escape from her bullies when she stumbles upon an odd book in the library: So You Want to Be a Wizard. Nita at first thinks it's a joke. But once she reads the mysterious book, an alternate universe of Manhattan reveals itself to Nita and her friend Kit. The pair embark on a terrifying adventure where real life and magic intertwine, and they find themselves entrenched in a battle between good and evil. Join Nita and Kit...