The Crossroads of Time (Crosstime (Crosstime/Blake Walker #1)
Andre Norton
Rated: 3.80 of 5 stars
3.80
· 10 ratings · 190 pages · Published: 1956
It was a chase that would take him through level upon level of unknown dangers in search of a ruthless genius who had found our Earth the perfect place to begin his series of conquests.
If Walker succeeded, he would save Earth. If he failed, his homeworld could be enslaved, and he could be trapped on an alien Earth!