A science fiction novel from an author whose very well received first novel, "The Gameplayers of Zan", came out of nowhere. He followed it up with several other titles published by DAW - and then, one day, was no more. No new books were released by either DAW or other publishers.
Used availability for M A Foster's The Day of the Klesh
October 1979 : USA Paperback
October 1979 : USA Mass Market Paperback