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.

Four worlds that cannot be visited. Four worlds that must be visited. 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.

They took the body of Park Lacoch and stripped away his mind. Then they stuck him aboard a spaceship and exiled him to Charon, from which no return was possible. And just when he thought things couldn't get any worse, Park found himself transformed into a changeling - a half-beast, half-man, with the beast rapidly gaining ascendancy....

Four worlds that cannot be visited. Four worlds that must be visited. 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. This frozen world is the last of the four worlds to be explored. But are Tarin Bul and his controller up to the job?