The arrival of a Detroit mobster in Lexington puts Raylan on a collision course with a sadistic Dixie Mafia hit man. Raylan also has another altercation with Boyd.

The murder of a fellow marshal throws Raylan together with a former female colleague, and Art leaves the office to track down another angle of the case. Meanwhile, Boyd engineers a showdown with Dickie Bennett, despite Raylan's effort to prevent it.

Raylan faces off with a tyrannical Oxy dealer, putting him on a collision course with the new head of the Dixie Mafia. Meanwhile, Boyd fights to regain part of his family's empire, but his methods could rip his crew apart.

Raylan races to save Dewey Crowe from a gang of vicious organ harvesters. Boyd faces off with a new adversary.

As Boyd fights for control of the Harlan oxy trade, Raylan works to keep the battle from becoming an all-out war while also battling a personal issue.

Raylan's tactics put him at odds with the FBI as he intensifies his efforts to take down Quarles and the Detroit mob.

A shocking murder forces Raylan to face past mistakes. Meanwhile, Boyd goes up against Harlan's corrupt sheriff.

Raylan pursues a Dixie Mafia soldier who could be the key to nabbing Quarles; Ava protects an imperiled prostitute by any means necessary.

Raylan struggles to keep Dickie Bennett in prison while contending with an increasingly violent and unpredictable Quarles.

Raylan squares off with a pair of merciless Detroit hit men. The battle between Boyd and Quarles comes to a head.

While Raylan closes in on an ever-more-unpredictable Quarles, Boyd enters into an unlikely alliance with Dickie Bennett in a last-ditch attempt to recover Mags's fortune.

After the murder of his friend, Raylan is a man on fire as he goes after any- and everyone he holds responsible on the way to a bloody final showdown.