Voight and Olinsky must revisit their past in order to stop an ex-con targeting cops for revenge. (41:16)

A member of the team is held hostage by a man desperate to find his missing daughter. (42:24)

The death of an eight-year-old boy sets off an investigation full of unlikely twists and turns. (41:26)

A familiar face steps in when an intelligence detective is abducted by a heroin kingpin in the season premiere. (42:24)

Intelligence comes to the aid of Commander Perry's nephew after he gets involved with a corrupt narcotics unit. (42:58)