A recently paroled master thief assumes the identity of Lucas Hood, sheriff-in-waiting of Banshee, Pa. Keeping his history a secret, Lucas befriends boxer-turned-bartender Sugar Bates, and settles into his new life as Banshee’s sheriff. Lucas inadvertently gets tangled up in the rampant corruption of shunned Amish gangster Kai Proctor, while keeping a vigilant eye out for Mr. Rabbit, the New York mob boss who wants revenge against Lucas and former partner and lover Carrie for the jewel heist that landed Lucas in prison.
Hanson decides to hold a rave in an Amish barn, selling homemade E pills stolen from Proctor to Banshee youth including Deva, Carrie’s rebellious daughter. Catching wind of the plan, Lucas and his team orchestrate a raid, but the effects of a tainted batch of pills send many revelers into convulsions, with one notable fatality.
A band of marauding bikers crashes the annual Banshee Spirit Festival, with deadly consequences, sparking Lucas and Siobhan to meter out vigilante justice. Burned after losing his key witness against Proctor, Lucas is further dismayed when an FBI agent arrives to monitor the situation. Rebecca Bowman, torn between passion and her Amish roots, finds a kindred spirit in the sheriff.
Carrie urges Lucas to let go of the past, even as an increasingly suspicious Gordon is hell-bent on uncovering hers. Cast out of her Amish home, Rebecca turns to Proctor to give her a new start in Banshee. A surprise visit from Rabbit’s lieutenant brings back a flood of memories for Carrie. As his family keeps vigil for the ailing Benjamin Longshadow, Alex gets a surprise visit from his sister.
As Rabbit closes in on Carrie and Lucas, Carrie flees the hospital in a desperate attempt to collect her family and get them out of town. Kai introduces Rebecca to the business world, and sends Lucas a message about fooling around with his niece. Alex Longshadow recruits a Proctor thug with gambling issues to deal with a work-stoppage problem at the casino.
Recalling a series of prison therapy sessions that fueled his hatred of Rabbit, and pressed by Xavier’s insistence that the FBI handle a kidnapping case, Lucas makes a decision that will change the collective fate of Carrie, her family, Sugar, Job and the entire Banshee police force. A special delivery at Alex’s doorstep leads Nola to reconsider her future. Kai teaches Rebecca the power of telecommunications.
Spurned by Deva and Gordon, Carrie is forced to take up a new residence. With his leadership abilities questioned, Alex ramps up his efforts to recover the money stolen in the casino heist. Siobhan relives a nightmare when her ex-husband shows up looking to reconnect. Lucas is asked to return Proctor's favor.
A shocking murder near an Amish farm fractures relations between the Kinaho tribe and the Amish, who are forced to rely on Proctor to fend off a vengeful mob. Investigating the crime on Kinaho turf, Lucas and his deputies find themselves confronted by uncooperative gang members and their imposing leader. Carrie welcomes an unexpected visitor, and Lucas deals with the sudden appearance of a most unwelcome one.
Following a lead, Lucas visits a strict Amish school teacher who might have insights into the murder of a Kinaho tribe member and the disappearance of Solomon Bowman. Emmett and Siobhan find transferring a prisoner more difficult than expected. Rebecca copes with the pain of her parents' rejection. Proctor offers Alex a peace offering. Nola delivers a final blow for justice.
An illegal search warrant helps Lucas bust Proctor, but at a cost. Sharp and his skinheads look for payback against Emmett, testing the limits of the deputy’s patience. Carrie provides the cash for Max’s treatments and takes a small step towards thawing out her relationship with Gordon and Deva. Job finally gets a lead on Rabbit.
In New York, Job drops in on a priest with ties to Rabbit, taking a hit for his troubles. Carrie's relationship with Gordon faces a new test in the wake of another revelation. Burton silences one traitor, but another eludes him. Alex vows to deliver evidence to keep Proctor behind bars. Emmett moves on, while Brock looks to move up. Lucas and Carrie brace for an epic showdown, as does an NYPD captain with ties to their past.
All hell breaks loose as Chayton and an army of Redbones invade Banshee, looking to avenge Tommy’s death. 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. 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.
Calvin is tested by Watts' mercenary partnership with Proctor, whose promise to the Colombians has taken a severe hit after the torching of his factory. Following separate leads in the serial-killer case, Dawson and Lucas converge in a members-only Goth club replete with painful SM initiation rites. Proctor, through Burton, sends a forceful message to his Amish kin. Brock vows justice in a televised press conference. Cruz scopes out Carrie's fortress while Sugar helps a displaced Lucas find familiar lodgings.
Resolved to leave Banshee, Lucas learns that the murder case he thought was finally closed may in fact be opening again. After a tense faceoff with Calvin and the Brotherhood, Proctor looks to finalize his deal with the Colombians. Carrie takes aim at one final act of vengeance. Brock demands allegiance from Bunker as Banshee braces for an uncertain future.