Den tidligere skarpskytte og marinesoldat Bob Lee Swagger, som nu lever et stille liv, går med til at hjælpe sin tidligere chef med at forhindre et mord på præsidenten.

Efter at være blevet sat bag tremmer har Bob Lee svært ved at beskytte sin familie. Isaac planlægger sit næste træk. Memphis forsøger at komme tættere på Bob Lees kone.

Efter en følelsesladet samtale med Isaac tager Bob Lee kontakt til Nadine og beder hende efterforske den betjent, der tog æren for hans pågribelse.

I en række tilbageblik kastes der lys over Bob Lee og Isaacs tjeneste i Afghanistan. Isaac føler sig presset til at rede trådene ud. Nadine søger hjælp hos en CIA-agent.

En eftersøgning af den kugle, der blev brugt til mordet, fører Bob Lee til en milits. Nadine gør en grum opdagelse.

Bob Lee søger hjælp hos sin tidligere instruktør, en enspænder, som måske har vigtige oplysninger. Nadine prøver at overtale Payne til at afsløre, hvad han ved.

Bob Lee tager på jagt efter den sjældne Black King-riffel. Nadine udnytter en mulighed for at tale med en journalist, der har insiderviden.

Mens Bob Lee planlægger slutspillet, beder han Julie om at tage Mary til et sikkert sted. Nadine bliver ved Bob Lees side, men er usikker på, om hun har valgt rigtigt.

Bob Lee indgår en uventet alliance i bestræbelserne på at blive genforenet med sin familie og blotter sig for den person, som af alle mest ønsker hans død.

Bob Lee besøger den russiske ambassade, hvilket gør Krukov vred, og det sætter scenen for det endelige opgør på liv og død.

Bob Lee Swagger and wife Julie join his former Marine unit in Germany and narrowly escape a deadly terrorist attack. FBI Agent Nadine Memphis, meanwhile, takes a job in Washington with Patricia Gregson.

Bob Lee investigates the terrorist attack that may have targeted his Marine unit. Memphis helps on the ground in Germany. Flashbacks to Afghanistan help shed light on who might be after them.

Bob Lee finds Isaac Johnson in Texas after an attempt on his life. Nadine discovers just how much influence Patricia Gregson wields, and a traumatized Julie fights to stay strong for her family.

Bob Lee and Isaac learn the world's greatest assassin is in the U.S. Flashbacks to a mission in Afghanistan reveal his identity: Solotov. Nadine comes to Texas with suspicions of a conspiracy.

Bob Lee works to piece together Solotov's motive for targeting their unit. Nadine uncovers a surprise witness to the event that set everything off. Solotov's hunt has him hiding in plain sight.

Bob Lee tracks Solotov's money, pitting himself against a Mexican cartel. Nadine helps a journalist investigate a cover-up involving Bob Lee's unit. Julie makes her frustration heard with a gun.

Bob Lee and Isaac must team up to escape a Mexican prison before Solotov finds them. As Nadine digs deeper into Atlas, the cover-up points back to Bob Lee's unit. Julie has problems with the law.

Bob Lee tries to draw out Solotov, but realizes he holds the upper hand; flashbacks reveal the origin of Solotov; Isaac is courted by his creator. Season Finale.

Julie and Isaac team up to save Bob Lee after he is kidnapped by Solotov; Nadine confronts Hayes about Atlas; new information about Bob Lee's father, Earl Swagger, sets off a new mission.

Bob Lee visits a local prison for answers about his father's murder; Julie takes a job helping the family lawyer; Nadine and Isaac grab Harris Downey, who knows more about Atlas than he realizes.

Harris gets on Bob Lee's nerves out on the road as they chase more leads. Nadine and Isaac locate a person of interest who may or may not be friendly.

Bob Lee pays a visit to the Pooles after hearing a new rumor, and Julie follows a lead of her own. Isaac and Nadine pursue an Atlas target.

A visit to an old friend of his father's leads Bob Lee back to D.C., where he connects with Isaac, Nadine and Harris for a mission at a formal event.

Bob Lee and Isaac are put through the wringer by a member of Earl's Vietnam unit. Julie stands up to the Bama family. Nadine sneaks into a high tech security facility.

Bob Lee and Isaac meet with a former high level operative as they close in on solving Earl's death. Nadine is sent on a dangerous mission by a DOJ operative.

An attempt on Sam's life leads the Swaggers to shocking information left behind by Earl, which may have led to his death; Nadine and Isaac's team take a run at one of the heads of Atlas.

Bob Lee's search for Bama Jr. leads him to a fringe group, but causes a rift in his marriage; Isaac and Nadine use information left behind by Earl to meet with the President's Chief of Staff.

Bob Lee and Isaac ambush the Atlas training facility; Nadine and Harris scheme their way into a face-to-face with a critical player in Atlas' plot to retain power; Julie's paranoia grows.

Harris helps Bob Lee get payback for Earl's death; Nadine and Isaac try to convert Atlas recruits to their cause; Julie experiments with putting life with Bob Lee in the rearview.

As Bob Lee finds himself torn between justice and family, Atlas pivots to a new game plan. Isaac and Nadine investigate an overlooked Jack Long thread. Harris meets with a powerful ally.

Bob Lee attempts to put an end to Atlas, all while trying to save his marriage and tie up the remaining threads from his past. Isaac, Nadine, and Harris find new roles for themselves in D.C. Series Finale.