The Computer Nut
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The Computer Nut (1984) is a children's novel written by Betsy Byars. Kate Morrison, the title character, is receiving messages on her computer purportedly from an extraterrestrial, BB-9, who claims he can monitor and control all computers on Earth. At first, she and her friend Linda investigate the communication as a prank; one of their suspects is Willie, who becomes Kate's friend and fellow enthusiast in the attempt to make contact with BB-9.

