Raylen turns to an art collector to help bring a criminal to justice, but the case soon turns to a murder investigation. Meanwhile, Raylen's ex-wife turns to him for help, and he turns to Boyd Crowder to gather dirt on his father.
Raylan tries to defuse a hostage situation in the Marshals' office without any casualties, and later discovers that his relationship with Ava could have repercussions on Boyd Crowder's prison sentence.
Fresh out of prison, Boyd Crowder begins his mission to bring "religion" to the backwoods. Meanwhile Raylan starts trying to make a new case against Boyd while working as a bodyguard for a judge whose life has been threatened.
Raylan learns that his dad's life is in danger because he ran Bo Crowder's business while Bo was in prison and ran it into the ground. Raylan turns to an unlikely source to pin a meth lab killing on Boyd Crowder.
The marshals are forced to turn to Arlo for help in making a case against Bo Crowder, but will he go along? Meanwhile, Bo is having problems of his own with Boyd, who continues to wage a religious war against his drug business.
Dewey Crowe returns and tries to score on a drug shipment, but the bus carrying the drugs is hijacked, and he tries to impersonate Raylan Givens to get it back. Meanwhile Boyd gets a proposition from some fellow coal miners.
Raylan helps Rachel find her brother in law, who has left a halfway house without permission to see his son on his birthday. He also begins investigating the oxy bus shooting and makes contact with the Dixie Mafia.
After Winona realizes that Raylan didn't recover her counterfeit $100 bill from the bank robbery, she drops another bombshell on him. Meanwhile, the coal mine offers Boyd a new job more suited toward his skills.
Still recovering from his gunshot, Raylan takes himself off of desk duty when one of Wynn Duffy's associates is involved in a murder. Meanwhile, Ava takes over Boyd's business while he is back in jail.
After the plan to steal Mags' money fails, Dewey finds him himself in a life or death situation in a last-ditch attempt to make money. Meanwhile, after Devil's attempted betrayal, Boyd decides to retaliate on his enemies.
Raylan tries to find Winona after she leaves him, Boyd tries to find out who hit his crew's oxy clinic, and Quarles takes an interest in Raylan after he finds out that he has been asking questions about him.
Quarles and Duffy kill Gary Hawkins and try to frame Raylan for his death, while also getting the FBI on his tail. Meanwhile, Quarles raises the stakes in his war with Boyd Crowder, and Ellstin Limehouse tries to decide whose side he's on.
Raylan tracks down Tanner Dodd, the Quarles associate who helped frame Boyd for planting a bomb in sheriff Napier's car. Meanwhile, Ava helps a prostitute who needs protection from Delroy after a robbery goes bad.
Dickie Bennett sets out to find the money Ellstin Limehouse stole from him, Robert Quarles takes a shot at Boyd Crowder's protection business, and Raylan has a run-in with a couple of hitmen from Detroit after Quarles threatens him.
Limehouse launches a plan in motion that will get rid of all his enemies once and for all, but will anyone take the bait? Meanwhile, Wynn Duffy works on getting Robert Quarles delivered back--dead or alive--to the Detroit mob.
Boyd steps up his battle with the new preacher in Harlan, the marshals run into trouble trying to interview fugitive Drew Thompson's "widow," and Raylan confronts Lindsey's ex husband and tells him to leave town.
Raylan and Boyd take different paths as they continue their search for Drew Thompson, but a third group thinks they have already found him. Meanwhile, the fallout from the Ellen Mae situation weighs heavily on Ava and Colt.
Will Arlo reveal the identity of Drew Thompson to Raylan, or will he take the secret to his grave? Meanwhile, Boyd tricks the local mob and Wynn Duffy, and Colt is blackmailed over not killing Ellen May.
While transferring Arlo's killer, former sheriff Mosley, to another prison, Raylan stumbles upon the identity of Drew Thompson. Meanwhile, Boyd and Ava discover that Colt did not kill Ellen Mae, and that sheriff Parlow is protecting her.
Loretta calls on Raylan when she and her boyfriend get trouble with drug dealers, Boyd tries to keep Mara Paxton silent and wait for his new shipment, and Dewey Crowe gets a visit from his cousin from Florida.
Raylan is threatened by a mystery man at Charles Monroe's mansion, Boyd faces a surprise temptation while trying to figure out who stole his shipment, and cousin Daryl encourages Dewey to stand up to Boyd.
After Dewey receives orders to kill Wade Messer, Raylan is informed that Messer has been working as a confidential informant. Meanwhile, Boyd confronts cousin Johnny on his betrayal and puts a tail on him to find out more.
Art stumbles on Theo Tonin's right-hand man while investigating Nicky Augustine's death, Boyd tries to tie up loose ends with Lee Paxton, the sheriff, and cousin Johnny, and Raylan tries to get the Crowes to leave Harlan.
Raylan goes to Memphis to talk to Hot Rod after his men are killed in Mexico, things get tense as Boyd and Darrell wait for the drug shipment, and Boyd and Ava make a deal to get their drugs in prison.
When Art is shot and is in critical condition, the marshals round up the usual suspects, until an unlikely person confesses. Meanwhile, Ava prepares for the fallout for killing Judith, and Boyd tries to make a new deal with Wynn.
The Mexican cartel catches up with Boyd and demands payback for the dead bodies, Ava goes on the offensive after being accused of snitching, and Wendy faces a hard choice after she learns that Kendal will be tried as an adult.
Raylan and Boyd separately find out why Avery Markham is buying up all the land in Harlan, as well as the consequences if you don't cooperate. Meanwhile, Katherine Hale pays an unexpected visit to Ava.
Raylan takes a break from the case to take a visit from Winona and their daughter, Boyd takes Ava to his cabin to confront her about her loyalty, and Ty is on the run without any help after the shootout with the marshals.
Raylan is captured by the authorities, but Art reluctantly lets him go and puts him back on the case. Avery gets to Ava and questions her about his missing money, but she winds up leading Boyd straight to them.