Michael Emerson (Ben Linus from Lost) plays Finch, filthy rich, CEO and computer programmer who built a machine for the government that takes all the surveillance information collected through the Patriot Act and sorts the violent speech, behavior, motives and intentions to find terrorist threats.
While setting up the project he discovered that the machine is unable to distinguish a threat of national importance that would kill many people from 'irrelevant' threats that would only kill single individuals... what he calls 'Person of Interest'.
The government having that much information seemed dangerous to him, so he left himself a backdoor into the machine just in case he needed to shut it down.
Because it weighed on his conscience to have the information that someone is going to die and not doing anything about it, he used his backdoor to retrieve the social security number of the 'Person of Interest'.
Which he promptly looks up without trouble and learns everything about them - somehow.
But being a nerd type with a wimp, he needed someone else to help him do something. That's where the second half of this duo comes in: Reese, your typical and largely less interesting 'super military trained, lost the love of his life, depressed and needing purpose 'hunk'' type.
Finch offers Reese a job, he takes it and now we have a episodic serial drama with a new 'mystery' every week with a discovery of the situation the Person of Interest is in, a quick win by the super-hunk, who seems to prefer shooting bad guys in the leg, and the only thing that seems interesting about the show so far : Back flashes of Finch's life when he built the machine.
The writing so far is straight forward plot plodding but at times witty, more so when Michael Emerson is speaking, so it makes one wonder if it's the delivery.
The plotholes are huge, though. They build up this machine as being able to trace everyone's every step they make and yet both Finch and Reese hide from it despite their conspiracies to stop (shoot in the leg) people. (and sometimes use hand held rocket launchers in the middle of city streets).