I originally bought this book for its great (uncredited) retro cover art, though try as I might, I can't seem to find out who did it. I know who's work it looks like, but I need to do a bit more research to establish if I'm correct or not. What I did discover however, is that this seems to be quite an important novel and apparently it was adapted into an episode for the classic 1960s television show The Outer Limits. The episode,"Corpus Earthling," aired on November 18, 1963.
Corpus Earthling, a science fiction horror novel by Louis Charbonneau (1960)