On this episode of Person of Interest…

Shaw is put under tests by Greer.

Shaw manages to escape and get back with the POI team.

They remove a chip inside her head.

Shaw and Root hook up.

Reese doesn’t trust Shaw, but Shaw decides to take the fight to Samaritan.

Greer is captured.

Shaw continues to be more and more paranoid, and Greer reveals that they let her go free and the drive they discovered was a kill switch for them.

Shaw kills Greer.

Shaw and Reese head toward the home base, but Reese questions Shaw.

Shaw shoots him and leaves him for dead.

Root manages to find Shaw.

Shaw takes her to a playground and reveals that she can’t control herself and that the only way to stop it is to kill herself. She tells Root that she was her safe place.

Shaw kills herself.

It turns out to be a simulation put on by Greer, and Shaw has killed herself again in the simulation.

Greer starts up a new simulation for Shaw.