When the Machine gives the number of Ian Murphy, a man suspected of being a stalker, Reese along with Shaw recruits Carter, Fusco and Zoe to investigate further into his background. But when they discover that Murphy has a son from a former lover who is now dead, they work to reunite the boy with his father and right the wrong set in motion by the boy’s grandfather, who wanted Murphy dead after he didn’t approve of him and saw him at his daughter’s funeral. Meanwhile Root sets her escape plan in motion with the help of the Machine when government operative Hersh tracks her down. Finch arrives at the hospital and finds to his horror the hospital staff incapacitated and Root gone.

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.

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.

Finch and Reese team up with unexpected allies as they race to fix the machine; as Detective Carter tries to apprehend Cal Beecher’s murderer, she finds herself up against HR — a criminal organization.

When a virus causes the machine to malfunction, numbers are issued irregularly; the team searches for an extremely elusive tech millionaire.

When a person of interest is poisoned, Finch and Reese only have 24 hours to identify the toxin and find the person responsible; Detective Fusco’s past catches up to him.

Finch infiltrates a tech corporation to gather intel on an executive whose number has come up; Carter questions Beecher’s integrity.

Finch and Reese head to Atlantic City to protect the latest person of interest, an elderly gambler; Carter tries to clear another detective’s name.

As Finch and Reese try to protect six people simultaneously, clues lead them to a coastal town; when a storm forces Finch and Reese to seek shelter in a police station with a group of locals, they realize a killer may be in their midst.

The latest POI — a deadly yet sexy government operative (Sarah Shahi) who tackles terrorist threats — proves difficult for Reese and Finch to protect.

As Reese and Finch try to save a hotel maid’s life, they encounter a litany of suspects; Detective Carter considers a significant offer from the FBI.

Finch and Reese meet their match: a tech billionaire whose curiosity and endless resources could expose their identities and ruin their efforts to save his life.

Reese is abducted by a former acquaintance planning a massive and potentially deadly act of cyber-warfare.

Carter tries to help Reese by engaging in mental warfare with the FBI; Reese has encounters with old and new enemies; Detective Fusco must protect supermodel Karolina Kurkova, the latest person of interest.

Finch goes under cover to protect a youth who reminds him of himself; Carter goes on a dangerous mission for the FBI.

As the FBI pursues “the man in the suit,” Reese is even more determined to protect the latest person of interest after learning she is the sister of a soldier who was killed in action.

When the machine names a New York cabdriver as a person of interest, any of his passengers could be a part of the impending crime.

The team is spread thin when a husband and wife’s numbers both come up

The Machine gives Finch and Reese the number of a brilliant surgeon, but they soon discover that a resourceful third party has raised the stakes for this POI, forcing them to turn to an unlikely source for help.

Reese goes undercover in an idyllic neighborhood when The Machine’s latest number sends him to the suburbs.

Reese must protect an investigative journalist through surreptitious means to avoid becoming part of her story.

When The Machine gives them the number of a mob enforcer whose life becomes endangered, Reese and Finch must decide whether to intervene or allow karma to balance the scales of justice. Meanwhile, Finch seeks aid from an unlikely source.

With Finch back in the Library, Reese returns to field work, only to face his toughest case yet – protecting the privileged daughter of a Brazilian diplomat.

The Machine delivers the number of a cold case that leads Reese ever closer to catching up with Finch and his kidnapper, Root.

With Finch missing – kidnapped by his hacker nemesis, Root, Reese enlists Detectives Carter and Fusco to get his friend back, Meanwhile, The Machine never sleeps, disseminating a new number to Reese.

As the clock ticks down, Reese winds up trapped with his POI in the most heavily surveilled part of the city, forced to rely on the help of Finch, Carter and Fusco to fend off the FBI, corrupt cops and a slew of old foes.

The newest POI’s curiosity could spell his doom when he finds himself embroiled in a dark government conspiracy – one that Finch is all too familiar with. Meanwhile, Reese uncovers something revealing about Finch’s past.

Finch gives Reese his birthday off so that his partner doesn’t have to face a Number that is tied to Reese’s past.

Reese goes undercover as an armored car company employee, and faces memories from his past with the CIA.

When The Machine spits out five numbers, naming the Don of each of New York’s crime families, Reese and Finch suspect Elias is planning to eliminate his competition.

The Machine’s latest number presents a unique challenge for Reese and Finch since the person has virtually no digital footprint – and appears to be leading a double life.

When The Machine spits out the number of a 6-month-old baby, Reese and Finch turn into overly protective parents – with an arsenal at their disposal. Meanwhile, when Elias resurfaces, Detective Carter begins to question her new allegiance with Reese and Finch

The Machine leads Reese and Finch to Wall Street when a sharp young trader at a major investment bank becomes embroiled in a multi-million dollar financial scam.

Reese discovers there’s more to the story after he infiltrates a smuggling ring to get close to his latest POI.

The Machine identifies Darren, a teenager whose brother was just murdered, as the next POI. Meanwhile, Finch is growing concerned that the son of his former business partner is dangerously close to finding out about the Machine.

The Machine gives Reese and Finch the number of a down-and-out man who has been pushed too far, and they’re forced to turn to former Person of Interest Zoe Morgan for help.

When Carter finally comes face-to-face with Reese, he urges her to join forces to help with their latest POI, a scrappy young woman from the wrong side of the tracks who turned her life around and became a lawyer.

Reese is confined to a wheelchair recovering from his gunshot wound, but Finch sets him up in an apartment where he’s to keep an eye on the Super, who is their latest POI. Also, Finch approaches Carter and gives her a POI to show her what they do.

As Detective Carter deals with the fallout from her recent encounter with Reese and Finch, The Machine ups the ante for the duo by giving them four Social Security numbers instead of one.

Reese and Finch’s game of cat and mouse with Detective Carter becomes infinitely more complicated when The Machine declares that she is their newest POI.