Ace Books. Paperback original publication. This is Sheffield's first book. Sheffield would go on to win the Hugo and Nebula Awards, as well as the John W. Campbell Award for his writing.
In the 22nd century a combination of computer-augmented bio-feedback and chemo-therapy techniques has given man the ability not only to heal himself, but to change himself - to alter his very shape at will. But Form Change has its darker aspects, ranging from unautorized experimentation on human subjects to a threat to the very essence of humanity - a SIGHT OF PROTEUS.
Sheffield has written a thrilling novel of pursuit and unveiling in a world where the froms of humanity are practically boundless - until one man breaks an unbreakable law; until an alien force looses itself upon the world - and a planet that exploded sixteen million years ago delivers its final legacy...