The Wizard's Holiday: The Seventh Book in the Young Wizards Series
Rest and relaxation--that's what Nita thinks she's going to get when her little sister, Dairine, signs her up for a wizardly "cultural exchange" program, sending Nita and her partner-wizard Kit halfway across the galaxy over spring break. But nothing about wizardry--not even vacation--is ever quite that simple. Back home, Dairine and her dad have to cope with their side of the exchange: three young wizards who've just moved in and are eager to start experiencing a strange alien culture . . . Earth.
By: Diane Duane