Jax begins to doubt the club after a string of lawlessness hits the town. Meanwhile, his life also becomes unstable when he learns his druggy ex-wife has given birth to his son prematurely.

The deputy police chief poses a threat for the motorcycle club's power in Charming, as Samco deals with the aftermath of the illegal-arms-warehouse attack. Meanwhile, Jax continues to worry about his newborn son's fate and questions the club's strong arm tactics of doing business. Opie's financial difficulties force him to make a tough decision.

The Samcro members vie with local authorities to capture an assailant when a young daughter of a prominent family, the Charmings, is assaulted at a carnival.

Club members head to Nevada to store arms with the Devil's Tribe. And when the Tribe becomes threatened by the Mayans, Clay decides on a patch-over which makes them an official SOA charter. Meanwhile, an ATF member, Tara's ex, investigates Samcro.

An ex-SOA member who was responsible for Opie's arrest takes on Jax and Opie during a town fund raiser being hosted by Gemma. Meanwhile, Clay gives protection to a parolee who can mean a big payoff. Plus, ATF agent Kohn continues with the club investigation.

What seemed like a tiny favor for Piney's old war pal turned out to be a major problem for SAMCRO. Now that Clay is being detained, it is up to Jax to fix it. Meanwhile, Gemma deals with getting old along with the unexpected arrival of someone familiar who 's attentions have not been made clear.

The secrets in which Clay had buried earlier are exhumed when old bones are discovered on the outskirts of Charming. Meanwhile, SAMCRO has it’s sites set on the money, getting behind Half-Sack in a bare-knuckled fight. Krohn’s investigation becomes personal when he reveals his intentions.

With the IRA gun payment coming up SAMCRO needs to find the cash fast. The Mayans and Nords desperately try to solidify their alliance with each other. Meanwhile, Jax finds himself in a dangerous position with Tara.

A retaliation is planned by SAMCRO against a rival biker gang as they deal with an injured Cameron Hayes in the clubhouse. Meanwhile, Jax, Bobbie and Opie want to finally end that gun debt.

The women of SAMCRO are being pressed by ATF agent Stahl, and Jax believes the key to the clubs survival is Chief Unser. Meanwhile, the Kohn situation has Tara reeling, and Gemma receives some interesting information about Cherry from herself.

A member's arrest and the disappearance of another causes Jax's loyalty to SAMCRO tested. Meanwhile, Abel may be released from the NCIU due to his improving condition, but his homecoming may not be the only one.

Clay discovers there will be a significant amount of risk when he comes up with an idea to raise money for Bobby's defense. SAMCRO's trouble may overshadow Abel's homecoming.

The season finale finds the club members reevaluating their close bonds of brotherhood due to a tragic happenings.