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Page 108
In The Caves of Steel, Sarton could not have been killed by an Earthman because an Earthman could not have crossed the open spaces between New York City and Spacetown. A robot could have crossed the open spaces but could not have killed Sarton because of the First Law. Asimov solved the puzzle by having Enderby instruct Sammy to bring him the blaster across the open spaces and later gave it back to Sammy to return. It was an ironic confirmation of the necessity of C/Fe, the collaboration between humans and robots. The situation is similar in The Naked Sun. No murder weapon is found on the scene; Gladia, Delmarre's young wife, discovers the body and is overcome; and a robot who was on the scene and an apparent witness is incoherent and has to be destroyed. The situation is reversed, however, in that an outsider could have come across open country without difficulty, entered the house, and killed Delmarre, but would have experienced major psychological inhibitions in Delmarre's physical presence as well as having had to face Delmarre's neurotic reactions to his presence.
At the end of the novel Baley gathers together the suspects in true formal murder-mystery fashion, though in science-fiction fashion they all are present by trimensic projection: Gladia; Attlebish, the acting head of Solarian Security; Jothan Leebig, Solaria's best roboticist; Anselmo Quemot, a sociologist; Klorissa Cantoro, Delmarre's assistant fetologist (a Solarian expert on the external development of embryos and the rearing of children to be proper, non-gregarious Solarians); and Altim Thool, a physician. And in proper, formal murder-mystery fashion, Baley recounts each of their motives and opportunities for the murder before he accuses Leebig. Leebig, it seems, had been friendly with Gladia by way of frequent "viewing." More importantly, Delmarre had been working with Leebig on robotics and suspected that Leebig had plans to conquer the Galaxy by means of robots. Leebig had planned to build spaceships with positronic brains that could be instructed to attack other ships under the assumption that those ships, too, contained only robotic brains. Delmarre had been about to reveal Leebig's plan. Leebig had murdered him by creating a robot with detachable limbs. One of these limbs had been used as the murder weapon and then reattached. (Another ironic example of C/Fe.)
The Solarians are aghast at this perversion of robot psychology (they are surrounded by robots and their safety and peace of mind is dependent upon the sanctity of the Three Laws of Robotics), and they turn on Leebig. Leebig himself crumples and admits his guilt when Baley tells him that an assistant is present at Leebig's house and is going to

 
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