In a future New York where Earth's billions live in vast enclosed city-complexes and resent the robot-dependent Spacers who live in luxury off-world, detective Elijah Baley is assigned to investigate a murder—alongside a humanoid robot partner he deeply mistrusts. The novel is a tightly plotted science fiction mystery that uses its genre framework to examine human prejudice, fear of change, and the nature of humanity. A clever and propulsive genre hybrid.