Person of Interest: Season 4

The team adopts cover identities in the wake of Samaritan's rise. The Machine provides Reese the number of Ali Hasan, who has built a communications network VHF television antennas across New York that cannot be traced by Samaritan. When a street gang known as "the Brotherhood" forces Hasan to set up a network for them, Hasan attempts to assassinate one of the leaders via a bomb placed in a burner phone. In retaliation, the Brotherhood kidnaps Hasan's son; Reese hires Elias to recover him. Finch

Reese and Finch work to save the life of Claire Mahoney, a talented young mathematician who is heavily involved in solving a nautilus-themed cryptographic puzzle, a recruitment tool used to find gifted minds. Claire is unaware that Silverpool, a private military firm is targeting her for stealing files associated with the game. Finch learns that Samaritan is running the game and attempts to warn Claire against continuing. Claire ignores him and completes the game; she is held at gunpoint by Silv

The Machine's next number, wingman Andre Cooper, is discovered by Fusco to be preparing to testify against former mob associates who are now targeting him. Reese and Shaw rescue Fusco and Cooper from the mobsters' captivity. Finch and Root infiltrate a black market for weapons sales. Root subdues a group of Latvian gang members buying an AT4 anti-tank weapon; she and Finch uncover the mob's stash of money and weaponry, which they decide to use for their own work.

Reese is assigned to the case of a drug deal gone bad between a gang of Armenians and "The Brotherhood", who were introduced in "Panopticon". The team's latest numbers belong to siblings Malcolm and Tracie Booker, who stole the drug money from the scene to bail their imprisoned mother out of jail. While Reese works with a DEA agent to protect the kids, Finch consults Elias about the Brotherhood's elusive leader Dominic. Shaw abducts an injured Brotherhood soldier, nicknamed "Mini" (Winston Duke)

The Machine produces the number of Simon Lee (Jason Ritter), a brilliant political pollster and member of New York Governor James Murray's reelection campaign. Despite Lee's prediction, Murray loses, leaving Lee suspicious of the election result. The team discovers that the election upset is the result of vote rigging by Samaritan and that it wants Lee dead to tidy up loose ends. A series of flashbacks show the process Finch and Ingram went through to create The Machine. Reese is scheduled to at

The team receive the number of Walter Dang (Erik Jensen), a worker at an insurance company. Finch has to travel to Hong Kong to present a paper at a conference. Walter is investigating the death of truck driver Abel Mindler, who apparently committed suicide. He gets dragged into a gang war between Elias and the unknown adversaries. It is later shown that Abel was smuggling high explosive weapons to the same gang. The gang abducts Walter for the location of the truck which Abel drove and then dit

The latest number is Tomas Koroa (Gerardo Celasco), a wine dealer who's also an international thief. Shaw joins his gang. They rob a safe, which unexpectedly contains a deadly virus (Marburg, or "MARV"). The other members try to kill Tomas. Shaw intervenes, but they take the vials. Shaw tracks the virus to a secure storage facility and realizes that two government operatives are doing the same thing. One of them is her former apprentice, Devon Grice (Nick E. Tarabay). Shaw and Tomas break into t

The latest number is NYPD recruit Dani Silva (Adria Arjona). She is spying on her fellow recruits, though further analysis proves that Silva is not hunting them, but is instead already a cop from Internal Affairs, working undercover in the academy trying to expose a suspected mole. The mole is Silva's fellow recruit and friend, Alex Ortiz, who is acting on orders of the Brotherhood. Ortiz steals Silva's files from her handler and then murders him, framing Silva for the crime. Ortiz also steals f

Martine engages in a gunfight with Shaw, who ultimately escapes thanks to Root. Martine learns that Fusco had stopped the truck that Root and Shaw used to escape, on a suspicion of Narcotics possession. Pretending to be a DEA agent, Martine questions Fusco about it, but he sees through the ruse and gives her a false lead. Reese and Finch deal with their latest number, Elias. Dominic gets many of Elias's people to turn on him in exchange for promises of expanded territory and power under The Brot

To bring The Machine out of hiding, Samaritan showcases its strength by eliminating crime in New York City for a whole day. John finds out that Samaritan has learned how to deal with irrelevant numbers and has managed to prevent a series of crimes which would otherwise be taken care of by The Machine. Samaritan's actions leave Harold and his team with a difficult choice. When The Machine decides not to communicate with Samaritan, Samaritan changes course, bringing New York City to a halt by allo

The team go to install software at the stock exchange that will stabilize the market. However, they are almost immediately intercepted by Samaritan operatives, who corner them in a room. Out of options, the team turns to The Machine, who in a matter of seconds provides a multitude of projections and outcomes in each. While doing so, it reflects on multiple chess matches it played and the lessons it learned with Finch in 2003. In a final simulation, The Machine projects a roughly 2% chance of sur

During a mission to eliminate four suspected terrorists, ISA operatives (including Brooks and Grice from "Honor Among Thieves") eliminate three while the fourth, Yasin Said, escapes with his laptop. When Control requests access to the laptop's contents, Samaritan denies the request. Suspicious of Samaritan's actions, Control orders Brooks and Grice to make recovering the laptop their highest priority. But when they do so, Said escapes and the laptop self-destructs. Reese and Root, who have been

Root and Reese travel to the remote (and fictional) upstate town of Maple in search of Shaw. The two find a truck with a stretcher and medical equipment inside, leading them to a doctor; who was anonymously consulted for the job, but did not call the police since Maple has a history of job losses for those who ask too many questions. Root and Reese realize that Samaritan is experimenting with Maple as an "ant farm" to study human nature. After kidnapping and interrogating Maple's mayor Leslie Th

Harold is summoned for jury duty in the trial of a man charged with murdering his wife, the former CEO of a cellphone development company. Harold provokes the judge to get rejected from the panel, but is brought into it anyway. He is seated next to a former schoolteacher named Emma (Blair Brown), who turns out to be The Machine's next number. The team initially concludes that she is a perpetrator, being coerced to "fix" the trial; but later realizes she is supposed to convince the jury to vote "

Reese and Finch work to save the life of Anna Mueller, a software programmer at Fetch and Retrieve. She is being targeted because she expressed concern over the results VAL, a mobile app designed to aid users, is giving to people with depression that has resulted in suicides. Finch discovers a nautilus during the investigation and is contacted by Claire Mahoney (from "Nautilus") who tells him that she had recovered some source code from Samaritan and wants him to use it on his laptop, but he's s

Reese works to save the life of Harper Rose (Annie Ilonzeh), a grifter who is targeted by Dominic after she steals a large amount of money from a legalized marijuana dispensary. Her actions result in two of Dominic's men guarding a money laundering operation killed by the Parral Cartel. Dominic tracks down and interrogates her boyfriend Trey. Reese reaches out to Dominic and offers to return the money stolen by Harper in exchange for Trey and the hit being called off on Harper, but he refuses. H

The Machine's next number is a psychologist named Dr. Shane Edwards (Patrick Kennedy), whose wife was murdered eight years earlier, an event which continues to haunt him. The team determines that Edwards has been studying the people who traumatized his clients and got away with it, then carefully crafting frame-ups in order to punish them for their crimes. When Wyatt Morris (Daniel Sauli), the man convicted of murdering Edwards' wife is released from prison, Edwards stages his most elaborate fra

Reese and Fusco follow a bounty hunter named Frankie Wells (Katheryn Winnick) whose number has come up. She is trying to track down the man (Ato Essandoh) that killed her brother. Harper Rose ("Blunt") interjects herself into the cat-and-mouse case and manages to negotiate a resolution to a gunfight standoff between Reese and several other parties. Later, Harper tells Reese that Thornhill (The Machine) has been sending her texts. Finch resumes meeting with Elizabeth Bridges, whose number also ca

The Machine's next number is a brilliant developer and CEO named Sulaiman Khan (Aasif Mandvi), whose antivirus software is hijacked and he is framed for embezzlement. Samaritan and its operatives spend the episode trying to find and kill Khan, while the team tries to save him and determine what Samaritan is doing. They arrive at one of Decima's underground lairs in a forest, and discover that Samaritan is using Khan's antivirus software; Martine and her men arrive, resulting in Khan being captur

The new number is a man named Chase Patterson (Zachary Booth). Finch, Root and Fusco are then to work on a case between the two gangs of Elias and Dominic while Reese works on Chase's case regarding the death of Chase's whole family. When Reese asks about the file regarding Chase Patterson, he finds out it was a case of Carter's (Taraji P. Henson). As Reese dives into the case, different flashbacks are shown with Carter doing similar investigation to what Reese is doing. As Reese reaches the fin

Reese and Fusco race to find the next number, Carl Elias. They reach his hideout in a bank in Manhattan, but The Brotherhood arrive and capture them all. It turns out that Harper now works for Dominic. The Brotherhood tortures Elias for his intel, and Reese and Fusco for information on Harold. Elias tricks Dominic to kill his right-hand man, Link, to avenge the death of Anthony. In Washington, D.C., Control is interrogating a female Samaritan handler posing as a teacher, for a Samaritan's strate

Samaritan begins a series of power outages throughout the country. Having been sent by the Machine, Harper releases Fusco, but is caught by Dominic. The Machine allows Root and Reese access to its God Mode (from "Zero Day" and "God Mode"). Fusco and the NYPD arrest Dominic and Elias. Control believes "the Correction" is Greer's plan for a terrorist attack on the Supreme Court, but it's actually a list, created by Samaritan, of people who need to be eliminated for the betterment of society, inclu