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.
Samaritan begins to withhold information from the ISA, raising Control's suspicions. Meanwhile, Root and Reese search for their missing teammate.
When Decima prepares to bring the Samaritan AI online, the team finds itself caught between that organizations attempts to wipe them out and Vigilance's plan to put an end to intrusive government surveillance.moreless
The Machine sends the team five Numbers to try and determine what is going on in an impending catastrophe that it is blocked from seeing. Meanwhile, Root brings her assembled team of hackers to New York for the next part of her mistress' plan.moreless
Vigilance launches a new attack and the team splits up: Finch and Fusco go to Washington to investigate, while Reese and Sam go to a high school reunion to protect their newest Number.moreless
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
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.
Still in Arizona, the BAU make a familiar connection that could lead them to their prime murder suspect.
The BAU goes to Arizona to catch a delusional UnSub who thinks that women are out to get him.