Miles finds himself in danger when he ends up in the clutches of Andover, Charlie searches for Monroe, Rachel and Gene desperately try to revive Aaron, and Neville devises a plan to infiltrate The Patriots.
With Monroe facing the death penalty, Miles considers the consequences of his actions. As Charlie, Rachel and Gene question Monroe's true allegiance - since he might be their only ally in stopping the patriots, Miles himself is wary of his former friend's intentions. Meanwhile, Aaron continues to have visions that lead to endless questions.
Miles and Company are trapped in Willoughby. When Rachel discovers some unsettling truths, Miles does what he does best to overcome obstacles before him and those he cares about. Meanwhile, Charlie shares a moment with her mom, as Neville and Jason continue their struggles between father and son.
Aaron's deathly experience catches people's attention. As Miles and the gang try to escape the perils of their current situation, Rachel and Gene continue to struggle with their relationship, which affects Charlie. Meanwhile, Neville takes a gamble with the Patriots.
While Gene and Miles venture into Willoughby in search of allies, Monroe seizes an opportunity to surprise the Patriots. Meanwhile, Neville's political maneuverings put him and Jason in serious danger.
Empowered with authority by the President, Truman launches a mustard gas attack to kill Miles and Monroe. To Rachel's disappointment, Miles agrees to join Monroe in a ruthless plot to beat the Patriots at their own game. Meanwhile, Neville faces his own challenge from the Patriots, and Aaron grows increasingly alarmed by the power of the nanotech.
United by their desire to take the Patriots down, Neville and Monroe form an uneasy alliance. While searching for Aaron, Rachel comes face to face with the nanotech; and things don't go according to plan for Miles, Charlie and Gene when they try to steal the Patriots' supply of mustard gas.
In the series finale, the stakes are higher than ever as the Patriots prepare for war. Miles, Charlie and Monroe launch an attack on the Patriots, but must improvise a risky new plan in order to halt the oncoming war between California and Texas. Out for revenge, Neville sets his sights on President Davis. Meanwhile, Aaron and Rachel's efforts to save Priscilla from the nanotech have unexpected consequences.