Diane Duane

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.

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.

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 and find her.

While Nita's sister and her dad host three young alien wizards, teenage wizards Nita and Kit travel halfway across the galaxy as part of an exchange program and find themselves again caught up in the dark doings of their nemesis, the Lone Power.

While Nita grieves over her mother's death, Kit tackles a challenge as dangerous as it is strange: Rescue a young wizard who has vanished on his first assignment. This new wizard is unlike any other--he's autistic and he's a magical prodigy. His power is enormous. Now Kit and his dog, Ponch, must track down the missing boy before the Lone Power finds him.