This chapter undertakes to demonstrate the difficulty people might have in discerning if an individual is a human being or a robot. Francis Quinn, a politician who is running against Stephen Byerley, comes to U.S. Robots and asks Dr. Lanning if the company has made a robot that could pass as a human. Lanning denies that they have done so. Quinn wants Lanning and his team to determine the truth: is Byerley a robot or not? In an elaborate plan, Calvin arranges a test. Byerley disobeys the First Law, satisfying the electorate that he is not a robot. However, the story ends with a twist as Calvin demonstrates how Byerley could have circumvented the Law. Readers are left not knowing the truth about Byerley.