At first Alston answered in words, speaking aloud from habit. Vocal response was not required, meant nothing to the machine. The sounds were noted and filed for future reference. Precise brain-wave pattern measurements and analysis of physiological reactions combined into far more exact information about him than any word or thought formed consciously by the subject. The robot psychograph was lie detector, encephalograph, and electronic calculator. Its prying fingers reached into the human soul and came forth with stark truth. Sharp, incisive, implacable, the psychograph probed with its mechanical voice. Alston responded, his mind dulling, drifting on the vagaries of memory stream, lulled by the drone of heating tubes, the rustling hiss of his own breathing, the click of relays. Naked danger lay in this state for Alston, yet he dared not brace himself against the questioning. Synthetic memories would serve better if he yielded to his subconscious. His voice descended to wordless mumbling, then died away in cushioned silence. Above all, no thought of escape, of dying or disappearance. Alston was no different from other men except for the dogtag. He was cast in the same mold of common humanity, but the identification dogtag fastened on an impervium wire round his neck made the difference. A man with the VE convict dogtag broadcasting its invisible and inaudible signal cannot escape, cannot merely disappear. At any time, wherever he was, its signal could be tuned in and his exact position located. If the tag were forcibly removed by breaking the wire, almost an impossibility with impervium, the signal automatically became an alarm to summon patrol fliers from Castarona or Quanta City. The escapee would be picked up within a radius of five miles from the start of his break. * * * * * The field staff of Venusian Exports were a tough, hard-bitten, reckless crew, consisting largely of convict labor recruited from Luna Prison or the mines of Callisto. After serving part of their terms, they were permitted to volunteer and be paroled in custody of the company. In most cases, it was an escape from the frying pan into the fire. One year in the deep mines and five years on Venus in constant danger and under intolerable living conditions, Alston had developed certain facets of his remarkable personality at the expense of social instincts which seemed of no further use to him. Guilty or innocent, he had been sentenced and he was there. The abstract justice involved no longer mattered. He was vague about details that seemed several lifetimes ago, and six years of nursing a cumulative hatred of mankind had made him as wary, cunning and treacherous as any other wild beast.