Lucas, Brock and Siobhan exact payback on a skinhead responsible for Emmett's passing. Now waitressing at a local diner, Carrie faces new challenges in the wake of her revelation to Gordon and Deva about her past. After Alex Longshadow's passing, a new, menacing threat looms on the horizon for Lucas, not to mention Proctor and Rebecca: Chayton Littlestone, hell-bent on whipping the Kinaho tribe into a frenzy of violence against their enemies. Investigating the cuddle of four Marines, Lucas eyes the possibility of a huge if dangerous heist, and attempts to re-enlist Job to help him and Sugar pull it off.

As Lucas and Carrie case the tunnels under Camp Genoa, Proctor and Rebecca find themselves in a territorial faceoff with two rival drug suppliers and, later, are threatened by a pair of Chayton's thugs. Lucas and new deputy Billy Raven pay a visit to a decidedly unfriendly Kinaho bar. Carrie tries to end a relationship with Col. Douglas Stowe, who may be misrepresenting the amount of cash in Camp Genoa. Gordon hits rock bottom before resolving to turn his life around.

Lucas' secret could be about to be revealed. Tommy Littlstone makes plans for a second strike against Proctor.

Siobhan is torn between exposing Lucas and keeping his secret. Chayton readies his army.

All hell breaks loose as Chayton and an army of Redbones invade Banshee, looking to avenge the Tommy's passing at the hands of Raven, the Kinaho tribesman-turned-deputy. Holed up in the Cadi with Lucas and his deputies, Proctor is frustrated by his inability to attend to his ailing mother at home. As the assault reaches a fever pitch, Bunker tries to prove to Medding that he's not the man he used to be.

Reduced to the status of observer as the FBI plans a raid on the Redbone wilderness compound, Lucas decides to take matters into his own hands in his pursuit of Chayton. Still stung by Proctor's rebuke over her initiative in dealing with the Black Beards, Rebecca is further chagrined to learn of her uncle's burgeoning romance with Emily, Brock's ex and Leah's caregiver. Deva is drawn to a handsome stranger.

Despite Job's reservations, Lucas and his team pull off a daring heist at Camp Genoa. Lucas and Chayton are haunted by their recent deadly encounter. Calling a truce, Gordon and Carrie attempt an unusual intervention with Deva. Unbeknownst to her uncle, Rebecca heads to Philly to work out a deal with a spurned Proctor client.

Lucas and Brock head to Louisiana and the infamous Underground fight club in search of Chayton. Stowe pieces together details about the Camp Genoa heist, and who might be responsible. Burton's torment turns to resolve. Sugar looks to repay an old boxing debt. Rebecca's initiatives put Proctor and Emily in harm's way.

Lucas recalls the history of his friendship with Job, while pondering the future - if there indeed will be one. Proctor and Emily pay the price for Rebecca's recklessness. Carrie and Gordon pick up the pieces of their shattered relationship. Stowe and Leo land a big fish. Bunker reconnects with his skinhead past. Deva gets a lesson about crime and punishment.

As Lucas recalls a secret chapter in his life, Job gets special treatment from a fan of his work, while blaming Carrie for blowing the group's cover. Unexpectedly joined by Gordon, Lucas prepares to return to Genoa for a final negotiation with Stowe, or die trying. Bunker vows to shut down the Brotherhood, but his brother Calvin isn't about to back down. Joined by Rebecca and a new ally, Proctor heads to Philly to settle a score with Frazier and the Black Beards. After a bloody denouement in Banshee, Brock finally gets what he's been wishing for.