All 23 episodes from the fourth season of the American police drama following the Intelligence Unit officers of the Chicago Police Department as they tackle cases involving murder, organised crime and drug trafficking in the Windy City. In this season, Intelligence are assigned the case of a drive-by shooting that kills a local rap star, Burgess (Marina Squerciati) responds to a noise complaint and stumbles across a murder, and an internal investigation is ordered after Sergeant Voight (Jason Beghe)'s conduct once again comes into question. The episodes are: 'The Silos', 'Made a Wrong Turn', 'All Cylinders Firing', 'Big Friends, Big Enemies', 'A War Zone', 'Some Friend', '300,000 Likes', 'A Shot Heard Around the World', 'Don't Bury This Case', 'Don't Read the News', 'You Wish', 'Sanctuary', 'I Remember Her Now', 'Seven Indictments', 'Favor, Affection, Malice Or Ill-Will', 'Emotional Proximity', 'Remember the Devil', 'Little Bit of Light', 'Last Minute Resistance', 'Grasping for Salvation', 'Fagin', 'Army of One' and 'Fork in the road.