Manuel "Mannie" Garcia O'Kelly-Davis is the protagonist/narrator in Robert A. Heinlein's 1966 novel The Moon is a Harsh Mistress. A native-born inhabitant of Luna who lost his lower left arm in a laser-drilling accident and became a computer technician, he is drawn into revolutionary conspiracy by his assocation with Mike, a.k.a. 'Adam Selene,' a.k.a. 'Simon Jester,' a.k.a. 'Mycroft Holmes,' officially an augmented HOLMES IV system, is by far the largest computer in Luna and the secretly self-aware property of the Lunar Authority.

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