Don't take brilliant, shrewd Dairine Callahan for just any bratty younger sibling. Impatient for adventure, knowledge, and recognition, she finds her sister Nita's wizardry manual and reads the Oath aloud. Disappointingly, nothing happens. But when her family's new computer arrives, Dairene discovers more than the standard issue system software on it and launches herself on a reckless, universe-wide, high-voltage magical conflict with the Lone Power.
Being a novice wizard is not without its risk. Dairine nearly folds the known universe inside out with her first attempt at a space-time slide. It is the first of a series of spells that takes us jump after jump across the galaxy.