Intelligence pursues heroin kingpin Derek Keyes; Lindsay's downward spiral continues; Olinsky tells Platt about a secret from his past; Roman talks to Burgess about his concerns regarding Ruzek.
Roman and Burgess discover the corpse of a young boy who was reported missing; Burgess talks to Ruzek about Roman's suspicious behavior; Bunny plans to make a statement that could impact Voight's career.
A desperate man searching for his daughter holds a member of the team hostage; Voight learns about the accusations Bunny made regarding a case from his past; Antonio finds out that Olinsky has been keeping a secret.
Voight believes the man who tried to kill him is someone he and Olinsky once put away; Atwater unintentionally spills information about Ruzek's history that disturbs Burgess.
Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.
Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.
Intelligence searches for a missing teen who they believe poses a threat to students at his school; Atwater wants to make a good impression on a police captain.
When Intelligence follows up on a tip about an upcoming drug trade, the team discovers a man's mutilated body; Burgess helps plan a surprise for Platt.
A decapitated corpse found in Lake Michigan is connected to Voight's social circle; Roman makes a grave error; Antonio makes a decision that could impact Michelle's future -- without consulting Olinsky.
A doctor connected to Voight is investigated after four patients with chemo overdoses are sent to Chicago Med; Platt and Burgess work to clear Roman's name.
A teenage girl is violated during a home invasion; Voight helps a former acquaintance; Platt and Mouch receive upsetting news regarding their upcoming wedding.
Voight wants to make his former cellmate a confidential informant as the unit tries to take down a big cocaine supplier and local dealers; Burgess makes a decision about her relationship with Ruzek; Roman works with Firehouse 51 to fund a wedding.
Lindsay goes under cover in hopes of finding a police officer who targets women leaving a local casino; Burgess needs Platt's approval to move forward with her plan; Antonio offers to take Roman's place in an upcoming boxing match.
After escaping from a New York prison, convicted killer Gregory Yates (Dallas Roberts) heads to Chicago; SVU members Benson and Tutuola help investigate a triple homicide in Chicago; the team seeks a connection between Yates and a missing woman.
Burgess finds heroin in a duffel bag belonging to a mild-mannered and respected college professor; Roman talks to Platt about his career; Halstead takes an off-duty security job working for the attractive owner of a medical marijuana clinic.
Lindsay, Halstead and Mouse search for a connection when two shootings take place in gang territory; a candlelight vigil is held for a young boy who was murdered in the first shooting.
During a bank run for his off-duty security job, Halstead and his co-workers are attacked by a violent robbery crew, which leads to a shootout; Voight and Lindsay talk to a dispensary owner who says her business has received threats from local gangs.
The team discovers a secret battered woman's shelter and learns the owner has been wounded and a resident has been abducted; Burgess and Roman track down a man who has been catfishing people on a dating app to rob them.
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.
After a cold and unmoving newborn baby is discovered in a duffel bag on a Chicago lakefront, Chicago Med is able to provide information that helps zero in on a suspect; Roman and Burgess grow closer.
When a man opens fire on a patrol car and wounds Roman, Burgess pursues the shooter; with no gun found at the scene, Burgess faces the accusation of shooting an unarmed man; the man who sent Voight to prison is assigned to help defend Burgess.
Lindsay and Halstead discover the youngest daughter is the only survivor of a shooting at a family home; Antonio and Olinsky investigate a pyramid scheme self-help group; Platt tries to convince Crowley that Burgess and Roman should remain partners.
When the body of a single mother is found in the trunk of her car, the team is shocked to learn the victim had contact with Voight's reformed son.