The team bring in a suspect during the investigation of a murdered marine. However, they are forced to start again when the suspect is killed.
The team investigates the death of a hip-hop artist who is murdered just days after signing a record contract with Kevin Smith.
Voight and the team take a look at a house that has been linked to a series of gangs; Halstead struggles to maintain his composure when he is confronted by people from his past.
A return to high school brings Melinda into contact with a dead cheerleader and her troubled former squad.
DB and the team investigate the murder of the leader of a team of ghost hunters, who seem to have got dangerously close to the spirit of a dead serial killer.
