Seeking a unique solution, each of the four worlds making up the Diamond is sent a person whose mind has been stripped of everything and who is now controlled by an agent of the Confederacy.
Park Lacoch's body (stripped of his own mind) is exiled to the hell-world of Charon, one of the Warden Diamond worlds being investigated for alien influences and presence.
Can he survive long enough to complete his investigation in this unbearably hot world where strange creatures roam and witchcraft is a normal way of life?
Charon: A Dragon at the Gate - The Four Lords of the Diamond 3
Jack L. Chalker