The story of Windy City's Police Department in Chicago.
Cast: Don Kress, Andre Bellos, Jason Beghe, Sophia Bush, Patrick John Flueger, America Olivo, Jon Seda, David Aron Damane, Zach Garcia, Laroyce Hawkins, Heidi Johanningmeier, Christopher Kahler, Kurt Naebig, Emily Peterson, Joe Reegan, Matthew Sherbach, Isaac White
In the Season 3 finale, the team investigates the murder of a single mom who was in contact with Voight's now-reformed son, who was himself brutally assaulted. Meanwhile, Roman makes a major decision; and Crowley plans to make changes within the unit.
Lindsay and Halstead respond to a shots fired call and discover one survivor: a young girl. In other events, Antonio and Olinsky investigate a "self help" group; and Platt makes the case to Crowley for why Burgess and Roman should remain partners.
Burgess gives chase after Roman is wounded by a hooded perp who opened fire on their patrol car and shoots who she thinks is the suspect, but no gun is found at the scene—and the person she shot is a 17-year-old honor student.
The team investigates when an abandoned newborn baby is found dead. In other events, Voight is surprised to learn that his son is in town; and Burgess and Roman grow closer.
The team looks for a suspect who held a woman for months, physically abusing her and psychologically attempting to manipulate her into forgetting her identity.
The team investigates a kidnapping at a secret shelter for battered women.
Halstead and his co-workers get caught up in a violent shootout with bank robbers while on his off-duty job at the dispensary.
The police investigate a boy's execution-style murder, which may be connected to another shooting. The incident also leads officers and members of the community to gather for a candlelight vigil.
A college professor is caught smuggling heroin to Canada.
SVU detectives Olivia Benson and Odafin Tutuola come to Chicago to help find escaped killer Greg Yates.
Lindsay goes undercover in an effort to track down a rogue police officer targeting women leaving a local casino. When Detective Martin Watts, who oversees all cases out of the casino, gets word of the investigation he becomes involved much to Voight's dismay.
Voight enlists his former cell mate to help take down a major cocaine supplier, while Burgess makes a move regarding her relationship with Ruzek and Roman comes up with a plan to fund Platt and Mouch's wedding.
The team investigates the robbery of a luxury condo and Voight suspects that the family was knocked out by a powerful gas.
A doctor from Voight's past is under investigation when four of his patients are sent to Chicago Med for an overdose of chemotherapy.
When a woman's decapitated body found in Lake Michigan is connected to Voight's social group, Lindsay worries that his relationship with the group could affect his ability to see the case objectively.
The team discovers the mutilated body of a government official and learn that he had access to very important devices.
Intelligence tries to find a missing teenage boy they believe could be a threat to the students at his wealthy school when they find disturbing drawings in his notebook.
The discovery of a body leads to a cache of weapons, which then leads Intelligence on a strange investigation into a team of "operatives" that are targeting criminals within the city. Roman treats a sick young boy to a day at the 21st district.
When an undercover job goes south, Ruzek is investigated by a street deputy who will determine his future with the unit.
Voight and Olinsky hunt down a criminal they once put away.
A disgruntled father threatens to hold a member of Intelligence hostage until the team tracks down his missing daughter.
Burgess and Roman find the body of an eight-year-old boy while pursuing a gang-banger.
Intelligence pursues a heroin kingpin who has a member of the team kidnapped.