Wizard's Holiday — Diane Duane

Sometimes even wizards need a break.

A little rest and relaxation -- that's what Nita expects when she and her partner-wizard Kit depart for a wizardly "cultural exchange" program that sends them halfway across the galaxy.

But nothing about wizardry -- not even vacation -- is ever quite that simple.

Nita and Kit find themselves on a planet that seems at first glance to be paradise: Death and pain are practically unknown, and everyone is happy. It should be a perfect world ... so why does Nita get the sense that something is desperately wrong?

Back home, Nita's little sister, Dairine, and her dad have to cope with their side of the exchange -- three young wizards have moved in and are eager to start experiencing a strange alien culture: Earth.

So much for time off...