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On Person of Interest Season 4 Episode 10, Samaritan makes a bold move by erasing crime in order to try and force the Machine out of hiding.
On Person of Interest Season 4 Episode 9, Root and Shaw disagree over how to handle a new threat from Samaritan while Reese and Finch get caught up in a gang power struggle.
On Person of Interest Season 4 Episode 8, Reese goes undercover to the police academy to keep watch over a young officer.
On Person of Interest Season 4 Episode 7, Shaw risks being detected by Samaritan while Finch and Root head off on a dangerous mission.
Finch's cover takes him to Hong Kong while a mild mannered office worker ends up posing as a detective on Person of Interest Season 4 Episode 6.
On Person of Interest, Capt. Moreno gives Reese an order that sidelines his work and Finch suspects a connection between a political pollster numbers and his own.
Reese's cover is threatened when the NYPD gang unit investigates a pair of siblings on Person of Interest.
The Machine sends Finch and Root out on an unexpected errand while Reese tries to fit in at the new job on Person of Interest.
When the latest person of interest is a brilliant college student involved in a dangerous scavenger hunt, Finch's resolve to avoid new numbers is tested on Person of Interest.
Season 4 of Person of Interest premieres Tuesday, September 23rd on CBS.