Welcome to Parallel University, where the students all come from parallel universes ... and where Merri Terryl, a freshman from a post-nuclear Earth, makes a shocking discovery: something is causing the various parallels to wink out of existence. With the help of her friends (a nocturnal boy, a Roman gladiator, and an irresistible android), she travels from world to world until she discovers the cause — and the staggering evil behind it. But by then it may be too late to save all reality.