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.

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

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.

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.

While the club's on a man hunt, Jax faces the toughest decision of his life.

Both the ATF and the Russians prove to be obstacles as the club looks to heal old wounds and settle old scores.