The Quizzer was an unbeautiful two-foot cube of machine. Easing itself with delicate ruthlessness through the Psychologist's mental defenses, it droned its findings step by step into Iliff's mind. He could have done the work without its aid, since the shield had never been developed that could block a really capable investigator if he was otherwise unhampered. But it would have taken a great deal longer; and at best he did not expect to have more time than he needed to extract the most vital points of information. Besides, he lacked the Quizzer's sensitivity; if he was hurried, there was a definite risk of doing irreparable injury to the mind under investigation—at that stage, he hadn't been able to decide whether or not it would be necessary to kill the Psychologist.