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Although the Earth-appointed Protector of the Lunar Colonies (universally called the Warden and just as universally reviled) holds power, in practice there is little intervention in the loose Lunar society. There is work enough for anyone who wants it.
HOLMES IV (High-Optional, Logical, Multi-Evaluating Supervisor, Mark IV) is the Lunar Authority's master computer. It has gradually been given almost total control of Luna's facilities as a cost-saving measure; it is cheaper (though not as safe) to have a single main computer and expand its capacity than to have multiple independent systems.
The story is narrated by Manuel Garcia "Mannie" O'Kelly-Davis, a one-armed computer technician called in when HOLMES IV begins behaving oddly. He discovers it has become self-aware; the malfunctions are the result...