Plot summary
The Machine grants both Reese and Root full administrative access and saves Reese (with Shaw) and Root (with Finch) from several potential threats. Root and Finch arrive at the Hanford nuclear facility where the Machine is kept, followed shortly by Reese and Shaw, the latter being slowed as the Machine directs them to rescue people from the irrelevant list. They find that the Machine has moved. Finch explains that he planted hidden code inside the Machine that would grant it the freedom to protect itself if it was at risk, code triggered by the virus from the Ordos laptop.
For failing to protect the machine, an unknown woman orders Hersh to kill Special Counsel. Meanwhile, Raymond Terney (HR) and Peter Yogorov attempt to kill Carl Elias. They are stopped by a masked Detective Carter, who wounds Terney and Yogorov and frees Elias. A payphone later calls Reese and Finch. Hersh talks with the unknown woman confirming that they received a relevant number. The Machine then calls Root. In flashbacks, Ingram plans to tell the press about the Machine, but Hersh manipulates a suicide bomber into detonating a bomb on a ferry where Ingram and Finch are meeting. Ingram is killed while Finch is injured. Grace believes Harold to have died in the explosion.
Credits
Adapted from Wikipedia contributors, Person of Interest season 2. HTML formatting and reference markers removed.