Person of Interest2011

John Reese:
Finch I think I know who Thornhill is. He's a ghost. He doesn't exist.

Harold Finch:
I think you may be right, Mr. Reese.

John Reese:
I've seen it dozens of times before. A NOC sets up a business, residence, a whole life. Then the operation gets scrapped. No one cleans up the fake ID, and you wind up chasing empty town cars around the city.

Harold Finch:
Interesting theory. I have a different one. I was curious why I could only find one photo of Mr. Thornhill, so I did some investigating, inside the photo that we already have, and I uncovered some peculiar information within the file. Look at this. [Shows the photo on his computer] It's a composite.

John Reese:
So Thornhill's definitely a fake.

Harold Finch:
Of a sort. I accessed Mr. Thornhill's cell phone records, and according to the GPS data, was near Columbus Circle two days ago. He sent an email from that exact location at 4:32PM. [Opens camera feed]

John Reese:
And no one's there?

Harold Finch:
Someone spoofed the data. An algorithm. Complicated one. It's one of mine. I used it in the one place where it could never be duplicated - in the machine. Ernest Thornhill is not a spy, but you're right about the fact that he doesn't exist. He's the product of a survival instinct. Ernest Thornhill is the machine.