Diane Duane

Nita Callahan is at the end of her rope because of the bullies who've been hounding her at school... until she discovers a mysterious library book that promises her the chance to become a wizard. But she has no idea of the difference that taking the Wizard's Oath is going to make in her life. Shortly, in company with fellow beginner-wizard Kit Rodriguez, Nita's catapulted into what will be the adventure of a lifetime—if she and Kit can both live through it. For every wizard's career starts with an Ordeal in which he or she must challenge the one power in the universe that hates wizardry more than anything else: the Lone Power that invented death and turned it loose in the worlds. Plunged into a dark and deadly alternate New York full of the Lone One's creatures, Kit and Nita must venture into the very heart of darkness to find the stolen, legendary Book of Night with Moon. Only with the dangerous power of the wizardly Book do they have a chance to save not just their own lives, but their world...

Nita's bratty little sister Dairine, 10, is too smart and powerful for a new wizard. Her computerized wizard manual glibly sends her off on her novice Ordeal. Kit and Nita chase her across the galaxy, trying to catch up before she gets into trouble so deep that not even her brains can rescue her.

Traveling back in time to 1874 London to prevent an assassination plot against Queen Victoria, the feline wizards of Grand Central Station -- leader Rhiow and her able partners Urrah and Arhu -- must summon their powers to avert disaster in Victorian England, or else their archenemy, the evil Lone One, will warp time and trigger Armageddon. Teamed with a young Arthur Conan Doyle, Queen Victoria herself, and other historical figures, the feline wizards set out to find the forgotten magic that will rewrite history -- or the cats who can save mankind will never have existed.

Rhiow seems a perfectly ordinary New York City cat. Or so her humans think -- but she is much more than she appears. With her partners Saash and Urruah, she collaborates with human wizards to protect the earth from dark forces and maintain the network of magical gateways that connect to different realities. But amid this amazing secret animal world lies a danger that threatens not only the cats of the world, but humans as well.

To give Nita a vacation from magic--and to separate her from Kit, her partner in wizardry--Nita's parents pack her off for a monthlong stay with her eccentric aunt in Ireland. But the Old World is even more steeped in magical doings than the United States, and Nita soon finds herself and a host of Irish wizards battling creatures from a nightmare Ireland--a realm where humankind is the stuff of tales and storybooks, and where the legends and monsters of Irish mythology are a deadly reality. So much for vacation abroad....

Coming to the aid of a wounded whale, Kit and Nita are plunged into deep wizardry. The whale is a wizard, and she enlists Kit and Nita in battle against the sinister Lone Power. Becoming whales themselves, Nita and Kit join in an ancient ritual performed by whales, dolphins, and a single fearsome shark. But which poses more of a danger: the Lone Power, or ed'Rashtekaresket, the enormous shark as old as the sea?

In the hotly anticipated ninth installment of the Young Wizards series, Kit and Nita 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 inhabitants of Mars. But not even wizardry can help them cope with the strange events that unfold when the “bottle” is uncorked and a life form from another era emerges. Though the Martians seem friendly, they have a plan that could change the shape of more than one world. As the shadow of interplanetary war stretches over both worlds, Kit and Nita must fight to master the strange and ancient synergy binding them to Mars and its last inhabitants. If they don’t succeed, the history that left Mars lifeless will repeat itself on Earth.