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

Jax's decision without the club's approval doesn't sit well with Clay, especially when it brings dangerous repercussions upon the MC.

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

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.

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.

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.

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.