On this episode of Person of Interest…

Samaritan starts controlling the city by preventing crime, making everything run smoothly.

The next day, Samaritan turns the city into chaos by leaking information, etc.

Fusco tries to protect people in witness protection program, while Reese tries to save numbers.

After a standoff with some Samaritan agents, Root meets with Samaritan, using a child as its avatar.

Samaritan says it will destroy the Machine.

Shaw, tired of being stuck in the base, leaves.

Samaritan prepares Greer for its next move.

Greer’s past is revealed as an MI-6 agent who learns his boss was a double agent.