The club deals with the aftermath of their firearms warehouse attack as a new Deputy Chief of Police poses a new threat to SAMCRO.

When a daughter of a Charming family is assaulted during a carnival, SAMCRO seeks justice and races against authorities to capture the assailant.

SAMCRO travel to Nevada to store their firearms with a fellow MC. Meanwhile the Mayans pose to be another threat.

With Clay in custody Jax has to step up as Piney's old friend turns out to be a problem for the MC.

As buried secrets resurface in Charming, Clay has to deal with them. Meanwhile the MC looks to earn some money via Half-Sack's brawling.

SOA plans revenge on a rival biker club while hosting the wounded Cameron Hayes in the clubhouse. Meanwhile, Jax, Bobby, and Opie strive to clear the gun debt forever.

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.

The club needs cash to fund Bobby's defense, but Clay's strategy leaves them in a vulnerable position. Abel comes home for the first time. But the homecoming party ends in tragedy.

After a tragedy hits the club, the bonds of brotherhood are called into question and Jax must take a stand.

With the club divided in the wake of a tragic death, Clay sets up a new gun deal with the IRA.

The League takes bold new steps in their quest to undermine Samcro, forcing the club to take explosive measures.

Charming and its small-town appeal become vulnerable to The League, which finds new ways to provoke SOA members. Tara's compassionate efforts to help a distraught Gemma don't go unpunished.

Clay sets a course for retaliation; Gemma shows Tara how an old lady handles anger.

The club must make new alliances in prison to survive.

When Oswald puts 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 organises a meal. Clay comes to an agreement with Oswald when he learns Jacob is planning to run for mayor. Chibs's estranged wife Fiona Larkin (Bellina Logan) shows up at his hospital bedside, much to Gemma's chagrin. Lin has a proposal for SAMCRO, who are surprised to learn Marstein is still alive. Given the accounting job at Luann's studio, he informs SAMCRO that 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. Meanwhile, 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 (Winter Ave Zoli), and Edmond begins a relationship with Zobelle's daughter Polly (Sarah Jones).

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.

Chibs makes a secret deal with Agent Stahl in order to protect his wife and daughter. Opie learns the true circumstances that led to Donna's death and seeks both revenge and reconciliation.

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 SAMCRO. 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 flipped. After Jax witnesses Zobelle meeting Álvarez, SAMCRO inform Weston of the real nature of Zobelle's business dealings. Tara applies the lessons she has learned from Gemma to assert her position at St. Thomas. SAMCRO 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.

As SAMCRO attempts to rid Charming of Ethan Zobelle and The League permanently, familiar faces present new challenges.

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.