This is Book One of the Epic Tetralogy, The Four Lords of the Diamond.
Aliens are spying on Earth from one of the four worlds that make up the Warden Diamond. But it is impossible to send agents to any of the four worlds because of unique microscopic symbionts that make it impossible for visitors to leave the Diamond.
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.
Lilith is the first planet to be visited. Here, Cal Tremon, stripped of his own personality, must overcome incredible odds and survive not only the incredible perils of the foreign planet but his own controllers as well.
"A Reader's Guide to Science Fiction" has praised Jack L. Chalker for his ." . . inexhaustible imaginative concepts," adding that he is very popular with the non-stop action SF readers," who, in Chalker's case, number in the hundreds of thousands. Author of numerous best-sellers, Chalker is a familiar figure at SF conventions, often as a guest speaker, frequently as toastmaster.
Kirby Heyborne is an accomplished actor, musician, and comedian who has received a number of AudioFile Earphones Awards for his audiobook narrations. He has had starring roles in over a dozen features and many short films. Kirby is also a cofounder and director of the Los Angeles-based improv comedy group The Society.