On Chicago PD Season 4 Episode 23, Lindsay faces a review board just as her mother becomes the prime suspect in the murder of her boyfriend.

On Chicago PD Season 4 Episode 22, Intelligence investigates when a group called Perv Hunters may be involved with torturing and killing a man online.

On Chicago PD Season 4 Episode 21, as the bank robberies continue, Lindsay makes a decision that reveals an unexpected suspect behind the mask.

On Chicago PD Season 4 Episode 20, While investigating a teenage boy’s murder, Voight finds a connection with the murder weapon linking it to a case from 17 years ago.

On Chicago PD Season 4 Episode 19, Burgess finds that her sister never made it home, and the Intelligence team makes finding her their main priority.

On Chicago PD Season 4 Episode 18, a murder case leads Intelligence to investigate one of Chicago’s wealthiest families as they uncover secrets and lies.

On Chicago PD Season 4 Episode 17, Intelligence is led to a kidnapping victim locked up in a shipping container which leaves Voight questioning their case.

On Chicago PD Season 4 Episode 15, Olinsky goes undercover as a hitman for hire while Ruzek ends up on patrol duty after his undercover assignment.

On Chicago PD Season 4 Episode 14, Lindsay and Halstead get an odd warning while the team investigates a home explosion that burned a body beyond recognition.

On Chicago PD Season 4 Episode 13, Halstead goes undercover when a resident at a treatment center for troubled girls is crushed to death.