The Crossroads of Time Author:Andre Norton When Blake Walker foiled a murder attempt on one of his neighbors, he somehow found himself drafted into a frantic chase for a dangerous criminal- through the almost infinate levels of alternate Earths. — It was a chase that would take him thorugh level upon level of unknown dangers in search of a ruthless genius who had found our Earth to be the... more » perfect plae to begin his series of conquests.
If Walker succeeded, he would save Earth. If he failed, his homeworld could become enslaved, and he could be trapped on an alien Earth!
An easy read. Fun read on a parallel time plot. Great for young people. Norton is one of the best science fiction writers because she makes thing easy to understand on an entertaining level.