The gang hope to be financially in the clear after their successful arms sale. But the ATF will be all over if they get linked to the warehouse arson where two Mexican immigrants were found. So the Sons exert pressure and call favors with authorities and auxiliaries, any way they can, including Jax's sexual excellence, to spy on and sabotage the investigation.
When the young daughter of a prominent Charming family is assaulted during a visiting carnival, Samcro races the authorities to capture the assailant. Meanwhile a new shipment of guns arrives from their IRA connection with an additional price. Tara's ex-boyfriend arrives in Charming.
The club travels to Nevada to store arms with a brother club The Devil's Tribe. When the Mayans pose a threat, Clay decides to patch-over the tribe, making them an official SOA charter. Tara's ex, ATF agent Kohn begins investigating Samcro.
Gemma hosts a town fundraiser, which brings the ex club member who was responsible for Opie's arrest back to town and into direct conflict with Jax and Opie. Clay deals with protecting a perverse parolee who can lead to a big payoff. ATF agent Kohn continues to investigate SOA.
A small favor for Pineys old war buddy turns into a big problem for SAMCRO. With Clay detained, Jax must step-up to handle the situation. Meanwhile, Gemma deals with the pangs of aging and the arrival of a familiar sweetbutt whose intentions are unclear.
When old bones are discovered on the outskirts of Charming, Clay is forced to deal with secrets he buried long ago. Meanwhile, the club sets its sights on prize money, backing Half-Sack in a bare-knuckle brawl. ATF agent Kohn's investigation turns personal when his true intentions are revealed.
Samcro scrambles to raise cash as the IRA gun payment comes due. The Mayans and Nords take an extreme step to cement their alliance. And Jax finds himself in danger as his relationship with Tara deepens.
As ATF agent Stahl pressures the women of SAMCRO, Jax looks to Chief Unser as the key to the club's freedom. Tara can't escape nightmares about Kohn. And Cherry reveals secrets about her past to Gemma.
One SOA member is arrested for murder. Another goes missing. Jax has to choose between the club and one of his closest friendships. At the hospital, Abel grows stronger, but he's not the only one coming home.
When the MC heads north on a "charity" club run, they find more than just bike trouble when they cross state lines. And with Samcro out of Charming, Gemma's left in a compromising position with The League.
With Oswald putting up the bail money, SAMCRO are released from prison, but the split between Clay and Jax is wider than ever. Complicating matters, Caruso's thugs attack Luann's studio. In an effort to heal the tensions between her husband and son, Gemma decides to organise a meal, whilst Bobby pushes to try to find out what is at the core of the dispute. Clay comes to an agreement with Oswald when he learns Jacob is planning to run for mayor. Chibs' estranged wife, Fiona Larkin, shows up at his hospital bedside, much to Gemma's chagrin. Lin has a proposal for SAMCRO, who are surprised to learn Chuck is still alive. Looking for work, Tig gives him the accounting job at Luann's studio, and he informs them the Triad and the 9ers have been losing territory to the Mayans. When Jax, Bobby and Opie go to see Laroy to ask him about it, they get something unexpected. Weston is not entirely happy with Zobelle's latest decision. Gemma's efforts to help Tara backfire. Opie begins to get close to one of Luann's girls, Lyla Dvorak. Edmond begins a relationship with Zobelle's daughter, Polly.
When SAMCRO's adult film business becomes a hindrance to the club, Clay seizes the opportunity to revive the gun-running cartel. As Jax and Clay continue to clash over club activities, their relationship reaches a new level of antagonism.
While the repo business proves more fruitful than the club ever imagined, ATF Agent Stahl gets up close and personal with the MC. Meanwhile, tension between Jax and Clay forces Gemma to make a tough decision.
The entire SAMCRO family goes on lockdown inside the clubhouse as war with the League approaches. Opie decides not to pursue revenge against Clay or Tig for Donna's death. Jimmy puts an end to Cameron's deal with Zobelle, agreeing instead to sell exclusively to the Sons. As Chibs backs out of the deal with Stahl and attempts to convince Fiona to let him protect her, Clay tells Jimmy that Edmond has turned on the IRA. After Jax witnesses Zobelle meeting Alvarez, the Sons inform Weston of the real nature of Zobelle's business dealings in Charming. Tara applies the lessons she has learned from Gemma to assert her position at St. Thomas. The Sons approach Laroy and Lin about uniting against their common enemies; the League and the Mayans. Edmond re-negotiates his deal with Stahl, seeking immunity for himself and Cameron. Hale makes a decision about what kind of chief he wants to be.
The aftermath of Abel's kidnapping has the Sons reeling - especially Jax, whose grief sends him into deeper turmoil over his future with the MC. Meanwhile Gemma, still on the lam, is hit with some unexpected news from her past.
As the whole of the Sons of Anarchy organization bears down on the outlaw motorcycle club's California-based Redwood Original chapter, President Jackson "Jax" Teller comes face to face with an extremely unpleasant reality.