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When the Machine can't finish its calculations on a fatal event, it sends the team to check out five separate numbers on Person of Interest.
Using Samaritan's feeds, Decima searches for Reese and Shaw on Person of Interest.
Reese goes undercover to get close to a Congressman who could bring down Decima's second Machine on Person of Interest
Shaw and Reese go undercover at a high school reunion to try and protect the latest Person of Interest.
Finch and Reese get the number of a former government contractor who is stalking a UN diplomat on Person of Interest.
Root's presence puts Finch's life in danger and then his number comes up on Person of Interest. Cal
Secrets about Finch's past and how they relate to present events come to light on Person of Interest.
When a 911 operator needs protection, Finch goes undercover at an emergency call center on Person of Interest.
Reese comes back to work with Finch but a turn of events may have them planning a heist that could end up with them all in jail on Person of Interest.
Reese realizes that his travel plans have been tampered with when he tries to leave the team for good on Person of Interest.