The great accomplishment of Philip K. Dick, in the words of editor Jonathan Lethem, was "to turn the materials of American pulp-style science fiction into a vocabulary for a remarkably personal vision of paranoia and dislocation." These four novels written in the 1960s are summits in Dick's career. They exemplify the hallucinatory logic, darkly comic exuberance, and unsettling prescience of Dick's genius. These are universes where alternate realities can be marketed and individual identity eroded in unexpected ways, and where the very question of what is human is redefined as the virtual becomes the real, and the divine may lurk in a mass-marketed drug or in a household product.