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There is no Next Episode of Person of Interest planned.
The Machine, now completely self-governed with its whereabouts unknown, resumes giving Finch its "irrelevant" numbers for people in danger, which include a U.S. naval officer in town for Fleet Week. However, with so many sailors flooding the streets of New York City, finding the officer in time presents an even bigger challenge for Reese and Shaw. Meanwhile, Carter has been demoted to a patrol officer as a result of her being set up by the corrupt police crime organization HR, and sets a plan in motion to eradicate them for good. Also, Root tests the boundaries of her new asylum surroundings.
The number comes up for an Internet entrepreneur in the business of eliminating people's privacy, but finds his own being rapidly stripped away. As his life spirals out of control, Reese tries to protect him while Finch calls on Shaw, Carter and Fusco for help finding whoever is after him. Meanwhile, Carter finds herself unexpectedly paired with new rookie partner, Mike Laskey.
Reese and Finch enlist the help of Carter, Shaw and Zoe Morgan, who use their feminine wiles to bait a chameleon playboy who is either a predator or someone else's imminent prey. Meanwhile, The Machine helps Root to plot an escape from her psych ward confinement before a dangerous enemy can track her down.
The team gets the number of a prominent New York lawyer and has to determine whether she orchestrated the death of her recently murdered husband, or if she is being framed. Meanwhile, Carter faces an issue with her new partner, Laskey, after he spots her with Reese, aka "The Man in the Suit".
When Shaw is tasked to stay close to a 10-year-old identified by The Machine, she grudgingly develops respect for the young girl's skills in surveillance and realizes it could be the very reason why her number has come up. Meanwhile, Carter's mission to bring the crime organization HR to justice risks exposure.
Freed from her psych ward confinement, Root receives a directive from The Machine that requires Shaw's assistance - by any means necessary - and takes extreme measures to gain her compliance. Also, Reese and Finch look for clues as to why a mild-mannered estate investigator's number has come up.
The number comes up of a hypnotherapist whose life, upon investigation by the POI team, suggests he is more than just a master of the mind. Meanwhile, Carter tracks an antiquities dealer whose business is connected to the crime organization HR.
The POI team's war with HR nears a boiling point when Finch receives 38 numbers at once from The Machine. He discovers they are connected to an unknown player who is inciting an all-out war between the crime organization and the Russian mob. Meanwhile, a window into Carter's past is seen through flashbacks with her son's father.
Danger closes in when the battle to bring the crime organization HR to justice reaches new heights. Also, when The Machine suddenly gives out Reese's number, the POI team faces their greatest threat yet.
As the POI team seeks justice for Carter's murder, Finch realizes one of his team members may go one step too far in order to end the war with HR. Also, The Machine gives out the number for NYPD Officer Patrick Simmons, one of the crime organization's key players, in the dramatic conclusion of a game-changing three-episode PERSON OF INTEREST event.
Flashbacks to Finch's adolescence provide insight into his creation of The Machine. Also, the team receives the number of an already dying man, and Reese leaves the POI team behind in the aftermath of the war with the crime organization, HR.
Multiple enemies converge on the POI team as they protect a dying man with a connection to Finch's past whose number has come up. They struggle to keep their enemies at bay without Reese, who has left the team and their mission behind following the tragic war with HR. However, being down one man could have catastrophic repercussions for the team.
Reese boards an international flight in an attempt to put the team and the past behind him, but is angered when he realizes his travel plans have been manipulated.
Reese rejoins Finch in New York, but when the team receives the number of a highly skilled antiquities thief, a surprising turn of events finds them planning a heist which could land them all in jail.
Finch goes undercover in an emergency call center to protect a 911 operator, but it soon becomes clear that the threat reaches further than the team could have anticipated.
The secrets of Finch's operation before he enlisted Reese are revealed, including shocking ties to present-day events.
The Machine assigns Root to seek out a janitor with a mysterious past, but when her very presence puts his life in danger, Finch also receives his number.
Finch and Reese must delve into the murky waters of international politics when they are given the number of a former government contractor who is stalking a UN diplomat. Also, an enemy attempts to gain an upper hand on Root.
Reese and Shaw pose as alumni at a high school reunion in order to keep eyes on the latest POI. Meanwhile, Finch and Fusco travel to Washington, D.C., to investigate the motivations behind Vigilance's latest attack.
Reese poses as a Secret Service agent to get close to the latest POI, a U.S. congressman who may hold the key to derailing Decima's plans to bring a second Machine online.
As Decima uses Samaritan's feeds to hunt Reese and Shaw, Greer exploits Finch's greatest weakness in an attempt to lure him out of hiding: his love for his former fiancée, Grace Hendricks.
When an unknown entity prevents The Machine from seeing the full picture of an impending catastrophic event, it sends the team five separate numbers to help them piece together the bigger picture. Meanwhile, Root's team of hackers arrives in New York.
The team takes desperate actions in its race to prevent the malevolent AI program Samaritan from coming online and making them its first targets. Meanwhile, the months-long battle with the anti-surveillance terrorist group Vigilance comes to a shocking conclusion, on the third season finale of PERSON OF INTEREST.