On Chicago PD Season 4 Episode 12, a priest and parishioners block the police from entering their church when two murder suspects take refuge inside.

On Chicago PD Season 4 Episode 11, Halstead has Jimmy’s DNA tested while the murder of a sex offender leads to the revelation of a private police force.

On Chicago PD Season 4 Episode 10, a new member joins the team when Ruzek goes undercover and the team links a string of murders to a serial killer.

On Chicago PD Season 4 Episode 9, the team investigates when Kelly Severide is involved in a car crash and Lindsay considers meeting her estranged father.

On Chicago PD Season 4 Episode 8, Lindsay confronts Antonio about taking his new job, while the team is on the hunt for a cop killer.

On Chicago PD Season 4 Episode 7, Stone offers Antonio a job while the team investigates the death of a witness involved in a rape-and-murder case.

On Chicago PD Season 4 Episode 6, Burgess and Sorenson investigate when a dead teen girl turns up at the home of a baseball player who is friends with Olinsky.

On Chicago PD Season 4 Episode 4, when a car plows through a crowd outside of a concert venue and shots are fired, the unit suspects a terrorist attack.

Chicago PD Season 4 Episode 3 sees Platt attacked, but the investigation gets worse when CPD makes a gruesome find inside her father’s home.

Chicago PD Season 4, Episode 2 has the CPD searching for a missing victim. And after Halstead surprised Lindsay, why is she doing the same?