Garden CIty, NY: Doubleday, 1956. First Edition. Jacket design by Ruth Ray. VG (soiling to boards, a few bumps to edges, offsetting to endpapers, slight spine lean) in a Good + unclipped dustjacket (soiling and rubbing, chipping and loss to edges, light creasing to upper third, dampstaining to flap edges and at rear fold, fading to spine, tape ghosts on verso). The second novel in Asimov's Robot series.