Chicago P.D. >> Season 3

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. Antonio and Olinsky investigate a "self help" group. 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.

Responding to a call about a suspicious duffle bag at the Chicago Lakefront, Voight is horrified to discover that the bag contains the frigid and unmoving body of a newborn baby. Determined to find the culprit who abandoned the infant, Intelligence receives a promising lead based on information provided by Chicago Med and Ruzek helps zero in on a potential suspect. Meanwhile, Voight is surprised to hear that his son is in town and Burgess and Roman grow closer.

When Burgess and Lindsay respond to a call about a stabbing, the assailant turns out to be a kidnapping victim escaping her captor; Ruzek accuses Roman of having feelings for Burgess.

While responding to a call of shots fired, Voight, Antonio, Halstead and the team come across a secret battered woman's shelter and discover the owner has been wounded and a resident of the shelter has been kidnapped. Burgess and Roman go undercover to track down a man robbing people by catfishing them on a dating app. Lindsay opens up to Halstead about her past.

While out on a bank run for his off-duty security job at the dispensary, Halstead and his co-workers find themselves under attack by a violent robbery crew which quickly becomes a full-scale shootout. Voight and Lindsay question the owner of the dispensary who mentions her business has received threats from local gangs upset she's cutting into their revenue. Meanwhile Roman, Burgess, Antonio, Halstead, Ruzek and Atwater follow-up on a lead and track down a potential suspect.

When a young boy is executed, Intelligence turn to the boy's parents for information and upon further investigation, discover the father has a criminal background and was a part of a local gang. After another shooting in gang territory, this time nonfatal, Lindsay and Halstead speak to the victim's mother to see if the two crimes are related and Mouse works to find a connection. To honor the deceased young victim, Antonio, Platt, Roman, Burguess, Mouse and a number of other CPD officers and members of the community come together for a candlelight vigil.

While working at a sobriety checkpoint, Burgess finds a duffel bag full of heroin in the truck of a respected college professor who claims to know nothing about how the drugs ended up there. Voight decides to hold off on charging the unlikely suspect, and Olinksy and Antonio follow up on a lead to see who is behind the drug smuggling. At District, Roman expresses his desires to become a Field Training Office to Platt, and Mouse sets Halstead up with an off-duty security job working for the attractive owner of a medical marijuana clinic.

After infamous criminal Gregory Yates escapes from a New York prison, Lindsay and the team learn that he intends to flee New York and is headed for Chicago. The SVU team informs Intelligence that Yates has been gathering information on Lindsay and after Platt calls in a triple homicide likely at the hand of Yates, Benson and Fin catch the next plane to Chicago. Upon investigation of the crime scene, the team learns that another tenant in the building is missing and they work to find a connection between Yates and the woman. (Part 2 of a 2-part Law & Order: Special Victims Unit - Chicago P.D. crossover on 2-10.)

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. After recent events, Burgess sets plans in motion to transfer Districts pending Platt's approval, and Mouse attempts to lift Ruzek's spirits by offering to set him up with a friend. Meanwhile, Antonio volunteers to take Roman's place in the upcoming boxing match against Jimmy from Firehouse 51.

Voight convinces Deputy Crowley to bring in his former cellmate, Eddie Little, as a CI for the unit in order to help bring down a big-time cocaine supplier and his local dealers. Antonio is skeptical of this decision but Voight puts him at ease when he opens up about his time in prison with Little. Meanwhile, Burgess makes a difficult decision regarding her relationship with Ruzek and Roman devises a plan to help fund Platt and Mouch's wedding with the help of Firehouse 51.

Intelligence hunts down a crew responsible for a rape and robbery rampage. Lindsay is abducted on an undercover operation.

When the decapitated body of a woman found in Lake Michigan is connected to Voight's social circle, Lindsay fears his relationship with the group may hinder his ability to approach the case objectively. Roman is having a hard time coping with recent events and an error in judgment causes him to make a grave mistake. Meanwhile, Olinsky becomes upset when Antonio doesn't consultant him before making a decision that could affect Michelle's future.

When Intelligence follows up on a tip Antonio and Halstead received from a reliable informant about an upcoming drug trade, the team is shocked to discover the mutilated body of a man. Upon further investigation, the body is identified as a government official and when Olinksy, Ruzek, Lindsay and Halstead question the man's acquaintances they discover he had access to very important devices. Meanwhile, Burgess helps plan a surprise for Platt.

Intelligence sets out to find a missing teenaged boy who they believe poses a serious threat to the students at his wealthy school after finding disturbing drawings in his notebook. Meanwhile, Atwater is eager to make a good impression on a prominent African American police Captain and Olinsky and Michelle find themselves in a difficult situation and turn to Ruzek and Burgess for help.

The team investigates a band of rogue operatives.

Ruzek's job is on the line after an ill-fated undercover op.

After surviving a hit against him, Voight is convinced the culprit is a criminal he and Olinksy once put away and is determined to catch him before he injures anyone else. Atwater accidentally spills information about Ruzek's past which unsettles Burgess. Platt assigns Burgess and Roman a high society dognapping case.

While Platt tries to manage a chaotic desk area, a man struggling to get her attention takes a drastic action and demands that the unit find his missing daughter. Commander Fischer informs Voight that Bunny is bringing up new accusations on a case from his past. Lindsay urges her mother to fix the situation. Antonio is shocked to learn a secret Olinksy has been keeping.

While pursuing a gangbanger, Burgess and Roman come across the body of an eight-year-old boy who was reported missing. Intelligence launches an investigation to find the killer and Antonio and Lindsay question a prime suspect. Meanwhile, Burgess confides in Ruzek about Roman's suspicious behavior and Bunny heads to the Ivory Tower with a statement that could be detrimental to Voight's career.

Intelligence is in pursuit of Derek Keyes, number one on Chicago's Most Wanted list and heroin kingpin. Meanwhile, Halstead tries to get through to Lindsay as her downward spiral continues after her three-week absence from the unit. At District, Olinsky opens up to Platt about a secret from his past. Roman expresses his concerns to Burgess about what she's getting into by marrying Ruzek.