|Berkley Medallion paperback, June 1968. Cover by|
Richard M. Powers.
"BACK FROM THE STARS
Andrew Blake, found frozen in a space capsule after 200 years on a wandering asteroid, is brought back to a strangely different Earth.
In his search for identity he suddenly becomes frighteningly aware of two alien beings that lurk within his body. With this discovery as a clue to his origin, Blake gradually unearths the mystery-shrouded "Werewolf Principle" - a scientific theory buried in the past that promises startling consequences for the future..."