John Reese, former CIA paramilitary operative, is presumed dead and teams up with reclusive billionaire Finch to prevent violent crimes in New York City by initiating their own type of justice. With the special training that Reese has had in Covert Operations and Finch's genius software inventing mind, the two are a perfect match for the job that they have to complete. With the help of surveillance equipment, they work "outside the law" and get the right criminal behind bars.
For years, the Person of Interest team have been protected by The Machine, but as worlds collided and a rival AI known as Samaritan finally cornered The Machine inside the nation’s power grid, it was the POI team’s turn to protect Finch’s creation. In season five, the cold war is over. The world around us might look the same, but something has drastically changed. Samaritan’s lethal “correction” has initiated its control. Finch’s Machine is essentially dead. Shaw is still missing. And the team is once again hiding in plain sight. But with Samaritan’s invisible grip tightening everywhere, will Finch be able to rebuild and resurrect The Machine? And if he does, will it be the same Machine when it comes back online?