The repercussions from the Money Train Heist continue to plague the Mackey family as Vic ignites a war between the Armenian mob and a powerful drug cartel with ties to the Mexican government. In a plan to punish Shane for Lem's death, he tries playing all sides from the middle as he partners with a Latino real estate baron who, with help from a compromised federal agent, is blackmailing mayoral candidate David Aceveda.