The team receive the Number of a UN diplomat being stalked by a former government contractor. Meanwhile, Root faces an enemy from the past.
Root intersects with the team again when the Machine gives Finch the Number of a janitor after it sends Root to investigate the man.
In 2010, Finch and his current partner help a computer programmer on the run from CIA assassins named Reese and Kara, while a secret group tries to get the programmer's laptop for themselves.moreless
The Machine gives the team the Number of a 911 operator, and Finch goes undercover as a fellow operator to help her.
Reese reunites with the team to save an antiquities thief, but the group ends up in a high-stakes heist.
Reese's efforts to leave New York City and The Machine behind are thwarted when The Machine manipulates his travel plans and seats him on a plane next to a new Number.
Finch and Sam try to save Arthur Claypool from Control without Reese's help, since he is still MIA along with Fusco.
The team faces an unusual task when they must save the life of a new Number... who is already dying. Meanwhile, Reese leaves the team and Finch considers his past.
The Machine gives the team a new Number: Simmons, the corrupt HR officer that murdered one of their own. Meanwhile, Finch tries to stop a friend from going too far in their quest for vengeance.moreless
The Machine gives Finch Reese's Number as HR puts out a contract on the "Man in the Suit."
The Machine gives the team 38 Numbers, and they realize that someone is pitting HR against their Russian Mob allies with the intention to set off a war. Meanwhile, Carter's past with her ex-husband is revealed.moreless
The Machine gives Finch and Reese the Number of a hypnotherapist who is using his craft for personal gain. Meanwhile, Carter gets a lead on an antiquities dealer who could give her the means to bring down HR.moreless
While Reese and Finch deal with a new Number, Root abducts Sam to force her to help on a mission for The Machine.
A New York lawyer is suspected in the death of her husband. When her Number comes up, the team must determine if she's the killer or being framed by the real murderer. Meanwhile, Carter has problems with her new partner when he sees her with Reese.moreless
To get close to a playboy who stalks and--in one case--apparently kills women, Reese and Finch bring in Carter, Zoe, and Sam to get close to him.
While Reese tries to protect the newest Number, an Internet entrepreneur with a stalker, Finch sends Carter, Fusco, and Sam to find the stalker. Meanwhile, Carter learns to live with her new partner now that she's been demoted to street cop.moreless
While Reese and his new partner Sam try to find a Number, a naval petty officer in town for Fleet Week, Carter tries to eliminate HR for good after being demoted to patrol officer because of a frame-up. Meanwhile, Root settles in to her new life at the asylum.moreless
The FBI close in on Reese, who is trying to protect a psychologist from one of her patients. Meanwhile, Finch receives a visit from an old friend.
Finch finds a lot of in common with their newest Number, who has run afoul of the government. Meanwhile, Reese learns about Finch's past.
Finch gives Reese his birthday off so that his partner doesn't have to face a Number reminiscent of a case from Reese's past.
Reese goes undercover as an armored car company employee, and faces memories from his past with the CIA.
Reese and Finch learn that their new Numbers are the five Dons of New York City, and figure that Elias is making his move for complete control of organized crime.
Reese and Finch discover that their newest Number has almost no digital footprint... and a double life.
Reese and Finch become day-care providers when the Machine gives them the number of a six-month-old baby. Meanwhile, Carter begins to question her alliance with the two men when Elias shows up.
The new Person of Interest is a young trader who has become involved in a multi-million dollar financial scam, and Reese has to pose as a wealthy investor to watch their client.
Reese infiltrates a smuggling ring so that he can protect his newest Person of Interest.
While Reese and Finch look after their newest Person of Interest, a teenager whose brother was recently murdered, Finch worries that his dead partner's son Will is getting too close to learning the truth about the Machine.moreless