Promise
performed by Ben Howard

Set during the last days of the Ottoman Empire, The Promise follows a love triangle between Michael, a brilliant medical student, the beautiful and sophisticated Ana, and Chris - a renowned American journalist based in Paris.

When a father presents photographic evidence that points to his daughter's death as not being accidental, the team reopens the 2004 case of the overweight college freshman who died in a fraternity house fire. The victim's friend sees the victim standing in her bedroom door.

Glimpses of Emilia and Diego's past reveal a painful truth. Emilia learns about the government's involvement in La Mosca's kidnapping.

Injured Boyd unearths Groobes' grave looking for the money, giving the Federals time to close in on him. He runs further up the mountain, throwing dynamite to deter pursuit. Ava is brought to Loretta's barn to see Avery, and says that Zackariah helped her drag the money up to Groobes' property on a mountain now crawling with Federals searching for Boyd. They have her call the cabin and she speaks with Boyd, as Zackariah, telling him to bring the money to them, while enticing Boyd to rescue her as she's the only one who knows where the money is hid. Boyd tells them to meet him at another location to divide Avery's forces, drawing away Boon and Loretta. Art talks the state troopers into remanding Raylan to his custody, and is convinced to help Raylan find Ava. Having heard that police dogs tracked Ava's scent to Dewey's necklace, they realize she was picked up and force one of Avery's crooked cops to give up his location. Art must return to the manhunt so Raylan goes alone. Boyd gets there first using one of the crooked cops as a shield; Avery starts shooting and Boyd comes out on top, shooting Avery through the eye and killing all the crooked cops, then pulling the trigger on Ava though his gun is by then empty. Raylan arrives and kicks a loaded gun over to Boyd that they might finish their business, though Boyd refuses. Soon the Marshals arrive in force and Boyd is walked out in cuffs. Raylan is driving Ava in to Lexington, told that there are no deals to be made, ominous music playing as they drive through the hills. They are hit by Boon who forces a quick draw gunfight. Both men draw and shoot, Boon taking one in the upper chest while Raylan is shot through his hat, collapsing. Boon struggles to take another shot when Loretta steps on his wrist and watches him die. Raylan comes around and examines his wound when Ava drives off with his car. (It is suggested that she was picked up by Wynn Duffy, who also vanished.) Raylan moves on, and four years later he is in Miami and part of his daughter's life though Winona is with a new man. Raylan gets a lead and finds Ava living a quiet life on a ranch in Lebec, California, where she reveals that she has a boy, Zackariah, and desperately asks Raylan not to let Boyd know about him. Raylan leaves Ava but calls on Boyd, who is back to preaching in prison, and tells him that they just put together that Ava died on a stolen identity three years earlier. Boyd asks why Raylan went out of his way to deliver the news in person, and answers himself, "We dug coal together", to which Raylan responds, "That's right."