In order to save Nora from her injury, Miles leads the gang on a detour to visit an old acquaintance of his for medical support, but they quickly find themselves in unfriendly territory. Aaron recalls his meek history as he looks back at his pre/post-blackout life, and Neville delivers Danny to Monroe.

When Nora encounters a close relative, she must make a difficult choice between family and a promise. Meanwhile, one of the most ruthless members of the Militia is tracking Miles, Charlie and the gang and General Monroe hands Captain Neville a stern warning.

A final act of heroism by one of their own saves the lives of Charlie and the gang, but the loss devastates everyone and they must carry on with heavy hearts but increased resolve. Miles sets out on a mission with Nora to recruit his former Militia comrade, Jim Hudson and enlist his savage killing skills. Meanwhile, Rachel looks for a power source and a way back into the heart of her daughter Charlie. Rachel also attempts to elude the grip of Randall Flynn, her ruthless former boss and ally of Monroe.

When the past catches up with Miles and Monroe in the form of mutual heartthrob, Emma all hell breaks loose for them physically and emotionally. Charlie and Nora are the ones who rescue Miles this time. Meanwhile Aaron’s life is turned inside out while accompanying Rachel on her tenacious trek to the mysterious Tower where she plans to restore the power.

Rachel and Monroe battle with more than wits. Meanwhile, Miles, Charlie, Nora and Aaron get inside the Tower but Tom Neville and son Jason get shut out. Miles and Monroe once again face-off, this time even more lethally.

Rachel makes a valiant attempt to rescue Miles and to escape with an ailing Tribesman's wife, while Neville and Jason are caught off-guard, assaulted by violent refugees. Charlie and Adam are at odds over what to do with Monroe. Legions of Tribesmen threaten all of Willoughby but with questionable leadership and Aaron faces death, yet again.

Aaron and Rachel speculate on the extreme effects of Nano technology, while he also confides in Cynthia. Meanwhile a figure from Miles's rugged past, Texas Ranger John Fry reemerges. Fry could be Miles' chance to bring down the Patriots in a big way, however Fry will need convincing. Charlie has a surprise for Miles and her mother, while Secretary Allenford holds a secret important to Neville.

When Miles leads Monroe and Rachel south of the border; they're met with much more than they bargained for as Neville and Julia dance a delicate dance. Meanwhile, Charlie and Gene continue their search for Aaron.

Monroe leads Connor and Charlie on a risky mission, as Miles and Rachel keep an eye on things in Willoughby. Meanwhile, Neville gets a new assignment and Aaron reunites with an old friend.

Monroe, Charlie and Connor make their way back to Willoughby, where they find that the Patriots' reeducation center is up and running. An encounter with two of the center's young cadets leaves Rachel and Miles divided on the lengths they are willing to go in order to take down the Patriots. As Neville and Jason find a new ally for their mission, more about the history of the Patriots is revealed.

United by their desire to take the Patriots down, Neville and Monroe form an uneasy alliance. As Rachel comes face-to-face with the nano-tech while searching for Aaron, things don't go according to plan for Miles, Charlie and Gene when they try to steal the Patriots' supply of mustard gas.