In the season premiere, as the Sheldon Jin murder investigation moves forward, Voight is under close watch by Internal Affairs but he's still in complete command of the intelligence unit. A routine undercover job becomes anything but when Voight's SUV is T-boned while trailing an armored car carrying Ruzek. At District, Burgess meets her new partner, Sean Roman and tension is high from the start. Soon she realizes there's more to his story. After a long day, Lindsay pays a visit to someone she hasn't seen in a very long time - her mom, Bunny.