This is Final Book (Book Four) 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...