Diane Duane

During a summer vacation at the beach, thirteen-year-old wizard Nita and her friend Kit assist the whale-wizard S'reee in combating an evil power.

Long Island’s teen wizard returns in “an unusually consistent fantasy, rich in details, subplots, and Irish lore” from the author of High Wizardry (School Library Journal).
 
To give fifteen-year-old Nita a vacation from magic—and her partner Kit—her parents pack her off for a stay with her eccentric aunt in Ireland. But Nita soon finds herself with a host of Irish wizards...

“One of finest current writers of speculative fiction pays loving homage to its Golden Age in this ninth title in the Young Wizards series.” —Kirkus Reviews
In the hotly anticipated ninth installment of the Young Wizards series, Kit Rodriguez and Nita Callahan become part of an elite team investigating the mysterious “message in a bottle,” which holds the first clues to the secrets of the long-lost...

A novel “filled with very credible teen angst, morality, and an intriguing blend of science fiction and fantasy” from the author of A Wizard Abroad (School Library Journal).
 
Still recovering from an overly eventful vacation in Ireland, teenage wizard Nita Callahan is looking forward to some peace and quiet in her suburban New York home. Instead, her close friend Kit seems to...

Every eleven years, Earth's senior wizards hold the Invitational: an intensive three-week event where the planet's newest, sharpest young wizards show off their best and hottest spells. Wizardly partners Kit Rodriguez and Nita Callahan, and Nita's sister, former wizard-prodigy Dairine Callahan, are drafted in to mentor two brilliant and difficult cases: for Nita and Kit, there's Penn Shao-Feng, a would-be sun technician with a dangerous new take on...

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...

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...

Professor X, the X-Men's founder and mentor, and Shi'ar Empress Lilandra have been forced to love each other from afar-he has to remain on Earth to lead the X-Men, and she must stay with the Shi'ar to run the empire. Now, Lilandra must turn to the X-Men for help against a threat to her domain-and possibly the Earth as well. Shi'ar scientists have learned of a creature that devours galaxies and is heading toward Shi'ar space. Beset by a panicking...