Person of Interest is an American science fiction crime drama

John Reese, a former Green Beret and CIA operative, is burnt out and presumed dead, living as a vagrant in New York City. He is approached by Harold Finch, a reclusive billionaire software genius who built a computer system for the U.S. government after September 11, 2001 which monitors all electronic communications and surveillance video feeds, in order to predict future terrorist activities. The computer – known as "The Machine" – also predicts other lethal crimes as well, but being irrelevant to national security these were deleted daily. After the death of his partner, Finch decides to act covertly on the non-terrorism predictions, and hires Reese to conduct surveillance and intervene in these cases. To prevent abuse of its capabilities, Finch had programmed the Machine to only provide an identity of a person predicted to be involved in an imminent lethal crime, in the form of a Social Security number, but no details of the crime or whether the POI (person of interest) is a perpetrator or victim. Finch and Reese (and later others) then attempt to understand the case and stop the crime from occurring

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