In the first season finale, Harlan is turned into a battlefield when the tense situation between Raylan, Arlo, Boyd and Bo Crowder finally comes to a head. When Bo sadistically kills all of his son's followers, Boyd looks to Raylan for help. Arlo's plan to betray Raylan is found out, and he is shot by Raylan. Ava is kidnapped by Bo and Johnny Crowder, after which, Bo shoots Johnny for suspected collusion with Boyd. Boyd and Raylan go after Bo to rescue Ava. At the standoff, Bo is unexpectedly killed, in an ambush, by Miami gun runners who are after Raylan. Raylan and Boyd manage to save Ava and kill three of them, but one of them escapes. Raylan is forced to let Boyd (who calls Raylan his "only friend") chase after Bo's surviving killer.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Bo disowns Boyd and massacres his men, leaving Boyd to renounce his faith. Bo orders Arlo to bring him Raylan, so he lures Raylan to his motel room. Raylan notices Arlo reaching for his gun, shoots him, and kills Bo's men that burst in. Bo kidnaps Ava and shoots Johnny after realizing he conspired with Boyd to get him killed by the cartel so they could take over. He calls Raylan and demands they meet at his hunting cabin, and Boyd joins him to help rescue Ava. They kill Bo's men, but Reyes's niece and nephew arrive and kill Bo. Boyd and Raylan kill the nephew, and Raylan tries to stop Boyd from pursuing the niece. Boyd points out that Raylan's gun is empty and calls him "the only friend I have left in this world" before driving away. Raylan points his gun at him and mimes firing it.