Title: The Ganymede Takeover by Philip K Dick and Ray Nelson
Comments: An alien race is trying to take over earth but this isn't the human race's biggest problem. The leader of the strongest human dissident group has got his hands on a hell weapon, guaranteed to wipe out all sentient life - alien and human. Meanwhile a small town megalomaniac is attempting to use the conflict to establish himself as supreme ruler on earth, using technology designed by a psychotic psychologist to create nightmare images and phantom fighters who remain even after the machinery is switched off.
Fans of Philip Dick will recognise his familiar themes that question what is reality, the motives of therapists, simulators that are indistinguishable from humans and excessive drug use. While the book gives the impression of being dashed off while Dick was on an LSD trip and published before the editor could do his/her job properly, devotees of Dick's unique perspective will not be disappointed.