To combat Root and Decima, Reese and Finch must seek out unusual allies to save The Machine. Meanwhile, HR prepares to eliminate Carter when she probes into Cal's death. And in the past, the final fate of Nathan is revealed.
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The Machine becomes increasingly erratic because of the computer virus, and Reese and Finch must find an elusive tech millionaire. Meawhile, Carter puts herself at risk when she tries to find Cal's killer.
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Reese and Finch try to help a billionaire tech magnate only to discover that doing so may compromise their existence when he sets out to find out who they really are and what they know.
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The team has to protect two Persons of Interest when the Machine gives them the numbers of a husband and wife.
Reese is off to the suburbs to take on an undercover assignment to protect the newest Number.
A beautiful widow is about to get a giant life-insurance payout but the guys think something is up.
A thief that has been on the run from the FBI for years is tracked down by the guys.
The Olympic Trials finally arrive and the girls are nervous to see who among them has what it takes to make the team.
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.
The girls' families visit during the midway point of training camp for "Family Day".
While Carter closes in on Reese and Finch and the CIA close in on her, the two men investigate a suspicious building super whose number has come up.
An undercover cop is discovered murdered at a truck stop.
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