 The positronic brain of robot RB-34(Herbie) has an unforeseen  extra : he can read human thoughts. So his take on the First Law of Robotics ("A robot may not harm a human being or, through inaction, allow a human being to come to harm") is unorthodox: he tells human beings only what he believes will not hurt their feelings. Can renowned robopsychologist Dr. Susan Calvin  fix  RB-34? Or are there areas of her own psyche where she would rather not hear the truth?