Miles and Monroe don't have time to think. They carefully plant evidence pointing to the Patriots at the mill, then tie a cinder block to Fry's corpse and dump him in the river. As the group travels back to Willoughby, Texas Ranger Malcolm Dove gets word of Fry's AWOL status. Dove and his men trace Fry to the mill and eventually find his body at the bottom of the river. When one of them finds a Patriot bullet casing, Dove knows the first shots of a major conflict have just been fired. Miles and Monroe watch from a distance. Miles wanted a war... and he's about to get it.
Five days later, Rachel and Charlie put up a front with one another as the embers still burn over their disagreement regarding Monroe. Dr. Porter can't take it anymore. Charlie is back... and Rachel should just be happy about that. During a botched interrogation, Monroe obtains an unprecedented amount of intel but winds up killing a Patriot soldier. Miles is pissed about Monroe going off script, but results are results. Rachel confronts Miles about Monroe - why is he harboring this monster? Miles thinks Monroe can help against the Patriots, but Rachel isn't buying any of it. Meanwhile, Monroe is literally smoked out of his hiding place; outside, he's surrounded and arrested by a group of Texas Rangers and Patriots, working together! Miles and Monroe's plan to turn Rangers against Patriots has officially run aground.
Neville and Allenford trudge towards the Patriot reprogramming center. Neville tells Allenford she's free to go as soon as he lays eyes on his son. That moment comes quicker than both foresee, as they soon come upon two corpses inside a tent, and Allenford realizes the cadets are in the middle of a field exercise. Suddenly, bullets rain in their direction, and Neville and Allenford run for cover. As they near a factory, Neville turns around to suppress the cadets... only to find his son pointing a gun in his direction. The two lock eyes before Jason opens fire on Neville, forcing him to dive into the factory for cover. Locked inside, Neville rests his head on the wall, realizing the son he came to save wants him dead.
Three years after the Blackout, the Monroe Republic was started in a settlement camp. Monroe and Miles were naive then, and Miles was the one who seemed like a sociopath. Monroe had a pregnant wife back then, and she was his whole world. Now, after being arrested by the Rangers, Monroe sits in a Willoughby holding cell, awaiting trial... and a most certain execution. In a Willoughby bar, a reporter named Bonnie Webster approaches Aaron. She used to work at Forbes and remembers him gracing the front cover of their "30 Under 30" issue way back when. She works for the Patriot Press Corps, and her job isn't to tell the truth so much as it is to create heroes and villains out of the news, and she's definitely making them today on account of Monroe's arrest.
Deep inside the factory, Neville hides with Allenford. She knows there's only one way this can end, with Neville killing his son or Jason killing the both of them. Neville tries to deny this fate, but Allenford breaks down in tears: her son was in a similar reprogramming center in Cuba, and it made him a vicious killing machine. Neville springs into action, ingeniously taking out every cadet in the factory, until only Jason is left. When Jason inspects the corpse of one of his fellow cadets, Neville puts a gun to his head and tells him to give up. An epic fight breaks out. Just when it looks like Jason is going to choke his father to death, Allenford swings a metal pipe and knocks him out, saving Neville's life.
Miles and Charlie try to break Monroe out of prison, since they know he's their only shot at taking down the Patriots. But Rachel warns the Patriots of a possible jailbreak, and Monroe is moved to a nearby bank vault. When Miles confronts Rachel about it, she doesn't back down; if Charlie had been caught with Monroe, they would have executed her right next to him. Charlie tells Rachel that Monroe saved her life. Rachel's biggest problem has always been that she sees herself as smarter than everybody else and never listens. Meanwhile, in a nearby courtroom, the Patriots condemn Monroe to death by lethal injection. The execution will take place at midnight.
In a flashback, Monroe remembers the day that changed his life forever. His wife and baby died in childbirth, and he was at her side until the end. Monroe's heart hardened that day, and it never healed. Now, chained up and awaiting execution, Monroe can't help but laugh at the folly of it all. Monroe asks that Miles be his final visitor. The two reminisce about the good old days before Monroe asks Miles for a favor. He had a son with Emma, and he's never met the boy; Monroe asks Miles to take care of him. Knowing that Monroe is dying soon, Miles admits he knows about the boy and that he hid him from Monroe. Monroe can't believe it. Why would Miles do such a thing!? Miles walks away, leaving Monroe to die alone with his thoughts.
Monroe is led into a packed courthouse, where Dr. Porter awaits. Porter claims it's his honor to be the one lethally injecting Monroe. In a flashback, Monroe remembers the point after the Blackout, after his wife and child died, where he turned to the dark side for good. He robbed a nearby camp of all their supplies, just as Miles asked - but he killed all its inhabitants, explaining, "Bad things happen." Just before Porter injects Monroe, he turns to Rachel and apologizes. Then his eyes widen, and finally, once and for all, Monroe closes his eyes for the last time.
Miles can't help but mourn the death of his former best friend with whiskey. Bonnie, the reporter, tells Aaron he might want to skip town soon. Leveraging Monroe's execution, The Patriots and Texas Rangers have officially joined forces, and Willoughby is now officially part of the new U.S.A.'s jurisdiction, a little Guantanamo, deep in the heart of Texas. While Monroe's body is unceremoniously buried in an unmarked field, Truman tells Porter to keep Rachel and Miles in line. Porter, who apparently sold out Monroe, warns Truman not to touch Rachel or Miles - else what would Dr. Horn say? Unbeknownst to both of them, Dr. Horn is just entering town, in a wagon painted with the Eye of Providence and a Patriot flag.
Neville has an unconscious Jason tied up in the factory, in hopes of clearing the drugs out of his system. When Jason wakes, he lays into his father, going for the jugular. Did Neville know that Julia was having an affair at the time of her death? He must have known, since he's so good at reading people. Furious, Neville savagely backhands his son. Jason is all Neville has left. Whatever it takes, he will bring his son back. Neville begs, come to your senses and join my side. Meanwhile, Rachel takes a shovel to Monroe's grave... and begins to dig.
Neville saves a Patriot, old friends are reunited and the Texas Rangers visit Willoughby.