Everything you need to understand or teach High Wizardry by Diane Duane.
High Wizardry by Diane Duane is a fantasy that is the third book in the Young Wizards series, preceded by Wizards Abroad and Deep Wizardry. In this third of the continuing series, Nita's younger sister Dairine discovers her sister's wizard's manual and looks through it, reading the Oath that her sister and Kit took. It is not long afterward that she discovers she also possesses the power of Wizardry. Nita has...