Description: 3 books (Mindkiller (1982), Time Pressure (1988), LifeHouse (1997)) chronicle the story of visitors from Earth's future visiting the past to essentially harvest souls. Mindkiller is a 1982 novel by science fiction writer Spider Robinson. The novel, set in the late 1980s (re-edited later to begin in 2006), explores the social implications of technologies to manipulate the brain, beginning with wireheading, the use of electrical current to stimulate the pleasure center of the brain in order to achieve a narcotic high.