He was standing at the side of the glassite super-highway, his arm half-raised, thumb pointed in the same direction as that of the approaching rocket car. Ordinarily Frederick Marden would have passed a hitch-hiker without stopping, but there was something in the bearing and appearance of this one that caused him to apply his brakes. Marden opened the door next to the vacant seat beside him. "Going my way?" he asked. A pair of steady, unsmiling blue eyes looked him over. "Yeah." "All right, then