A man without a memory is stranded in a city filled with robots gone wild. At his side is a mysterious young woman who claims to know who he is but refuses to tell him. According to The Three Laws of Robotics, A robot may not injure a human being, which narrows the suspects when the robots find a dead human body. The man calls himself Derec; the woman is know as Katherine. Their real identities, along with that of the murder victim and the murderer, are just a few of the life-and-death mysteries the unlikely pair are forced to solve to survive on the fantastic streets of Isaac Asimov's Robot City.