There are seven billion-plus humans crowding the surface of 21st century Earth. It is an age of intelligent computers, mass-market psychedelic drugs, politics conducted by assassination, scientists who burn incense to appease volcanoes ... all the hysteria of a dangerously overcrowded world, portrayed in a dazzlingly inventive style. Winner of the Hugo Award for best novel, 1969 Winner of the BSFA Award for best novel, 1969