A series of violent crimes targeting members of the same church is investigated. Riggs, meanwhile, faces a moral dilemma when the one-year anniversary of Miranda's death sends him to a new low; and Trish and Roger disagree with RJ about his future.moreless
Riggs and Murtaugh investigate the theft of a car containing massive amounts of cocaine from an impound lot; and butt heads with a brilliant defense attorney: Trish Murtaugh. In other events, Murtaugh experiences chest pains.moreless
Murtaugh and Riggs square off with the L.A. Sheriff's department when their investigation into the death of a Texas Ranger leads them to a possible misuse of power. The case also surfaces a dark secret from Capt. Avery's past.moreless
Riggs and Murtaugh are caught in a turf war between a new generation of drug dealers and a Koreatown gang; Murtaugh is teamed with a temporary new partner; and Trish tries to set up Riggs with her co-worker.moreless
Holiday celebrations are curtailed by a homicide linked to the deranged nephew of a drug lord who has a history with Riggs. Riggs, meanwhile, recalls past Christmases with his wife; and Murtaugh is annoyed by a neighbor's obnoxious holiday decorations.moreless
Riggs cares for an 8-year-old boy who witnessed a deadly casino heist while Murtaugh tries to prove that he can be a motorcycle guy. Riggs contemplates what to do with the money he received from selling his home in Texas.moreless
Riggs and Murtaugh look into the murder of one of L.A.'s fashion expeditors and discover an underground DEA operation. In other events, with Trish and the kids away, Murtaugh goes on a "bender" and Riggs has all-too-real dreams of Miranda.moreless
The investigation of a young model's murder leads Riggs and Murtaugh to one of L.A.'s wealthiest families; and Riggs is jolted when an old friend of his wife's is also linked to the case. In other events, Murtaugh is shocked to discover that his daughter is sending racy photos to her new boyfriend.moreless
Murtaugh and Riggs target a former Navy SEAL. Murtaugh sees a parallel between the suspect and Riggs; and Riggs' connection to the suspect threatens to interfere with the case.
A string of burglaries hits close to home when one occurs in Murtaugh's neighborhood and another ends in a casualty. In other events, Roger Jr. reconnects with an old pal who may be involved in criminal activities.moreless
Riggs and Murtaugh's investigation of a drug cartel reunites Murtaugh with his former T.O. In other events, Riggs avoids the reality of Miranda's death by diverting himself with outside vices; and Murtaugh and Trish struggle to find alone time.moreless
A noise complaint at a boxer's home leads Riggs and Murtaugh to a case involving illegal gun runners; and Riggs becomes personally invested in the outcome when one of their targets reminds him of his late wife. Meanwhile, Trish worries about Murtaugh's health.moreless
Samaritan makes one last desperate attempt to preserve itself from Finch's virus, and the team go on what may be a suicide mission to stop it.
Finch breaks into the NSA to plan the virus that will destroy Samaritan... and the Machine. The only ones who can get him out alive are Reese, Sameen, and the Machine, if they can get to him in time. Meanwhile, the Machine shows Finch simulations of what the world would have been like without it.moreless
The President is tapped as the next Person of Interest, and the team finds itself receiving some unexpected help. Meanwhile, Finch goes on a roadtrip with the Machine to begin his final campaign against Samaritan.moreless
After Finch goes to the wrong place at the wrong time, Samaritan gets a fix on him and won't stop until it captures him. The team rallies to protect their friend... but not everyone will come out alive.moreless
The Voice uses a hapless locksmith to plant a bomb in an investment firm, in the first step of a new plan. Meanwhile, Sameen makes her way to New York and Root finds her.moreless
While Root protects a radio host who has tapped into Samaritan's secret communication system, the Machine instructs her in how to use it to contact Sameen. Meanwhile, Samaritan keeps chipping away at Sameen's resolve, and Fusco realizes that Finch and Reese will never trust him with the truth.moreless
Reese and Finch are trapped in a hospital ER when a superflu breaks out... and they realize that Samaritan is responsible. Meanwhile, Fusco continues his own investigation, while Sameen stages another escape.
The team's new assignment is protecting a couple on the day of their wedding. Someone wants to stop the wedding... or do they? Meanwhile, Fusco crosses paths with Bruce when the two of them investigate the new player in town, each unaware that it's Samaritan.moreless
Samaritan is connected to the newest Number: a sound analyst who is looking into the death of a high school classmate. Meanwhile, Elias' friend Bruce demands answers concerning who murdered the crime boss.moreless
Sameen escapes her captors and reunites with her teammates, but they soon realize that their friend may not be as free as she believes.
The team's newest Number has ties to the CIA, endangering Reese's cover when he's forced to intervene.
While Reese and Fusco deal with a backlog of Numbers, the Machine starts giving out false Numbers after its recent reboot. Worse, it flags three of the team members as threats due to their violent histories, and locks Finch and Root out of the system.moreless
Reese and Finch try to get the case containing the Machine's damaged code to the station so that they can decompress it. Meanwhile, Fusco deals with the aftermath of Dominic and Elias' shootings, while Root tries to dodge Decima's agents without the Machine's help.moreless
As Finch and Root go on a seemingly random series of errands to save the Machine against Samaritan's onslaught, Dominic threatens to shoot Harper and Elias unless Reese puts him in contact with Finch.moreless
The Machine sends the team two new Numbers: Elias and Dominic. Meanwhile, Finch and Root get a clue to Sam's whereabouts, and Control tries to learn the truth about Samaritan.
Reese sets himself to solve a case that Carter was never able to close.
Reese and Finch try to protect a software CEO whose behavior becomes erratic after a hacker attack reveals his secrets.
The team's new Number is Frankie Wells, a bounty hunter who refuses to give up on a target despite the threat to her life. Meanwhile, Finch links back up with Beth Bridges.