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.

A daring prison escape puts Raylan on the trail of two old foes. Meanwhile, Boyd confronts a traitor in his inner circle.

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.