Plot summary
The Machine's next number is a psychologist named Dr. Shane Edwards ( Patrick Kennedy ), whose wife was murdered eight years earlier, an event which continues to haunt him. The team determines that Edwards has been studying the people who traumatized his clients and got away with it, then carefully crafting frame-ups in order to punish them for their crimes. When Wyatt Morris (Daniel Sauli), the man convicted of murdering Edwards' wife is released from prison, Edwards stages his most elaborate frame: to commit suicide and make it appear that Morris murdered him.
In flashbacks to 2010, Harold is shown plotting revenge on Alicia Corwin, whom he believes is responsible for killing his collaborator, Nathan Ingram. As he is about to kill Corwin with a car bomb, he has an epiphany thanks to the intervention of The Machine. He uses that experience to persuade Edwards not to go through with his plan. Additionally, the team uncovers evidence that suggests Morris probably did not commit the crime. Harold and Reese discuss the fact that they may never know the full truth. In a session with his own therapist (Iris), Reese begins to open up about Jessica, the love of his life.
Credits
Adapted from Wikipedia contributors, Person of Interest season 4. HTML formatting and reference markers removed.