Reese and Finch attempt to save the Machine's source code before it deteriorates completely. Root finds it hard to deal with an onslaught of Samaritan's agents.
The Machine ends up malfunctioning during a reboot and gives Finch and Root with the numbers of loads of people not involved in any crimes.
Reese's cover could be about to be blown after he finds out that the latest POI has ties to his old colleagues in the CIA.
Shaw escapes her captors, but the team is unsure of her mental state when she begins to act paranoid and reckless.
Reese protects an NYPD analyst whose investigation into a software glitch has drawn the attention of Samaritan. Also, Reese and Fusco are threatened by an ally of Elias's, who is looking to avenge his friend's death.