When Hammer's license is suspended for gambling, he trains a racehorse he won and searches for the killer of the horse's former owner.
While responding to a complaint, Burgess and Sorensen find the body of a 16-year-old girl in a baseball player's (Billy Burke) house Lindsay receives a mysterious delivery that might have ties to her past.
The body of a college student is found with a backpack full of a drug linked to deadly overdoses around the city Tay finds a bloodied child with a dark story about his parents Mouse looks to re-enlist in the army.
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 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.
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 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.
The team discovers a secret battered woman's shelter and learns that 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.
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.
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.
Bull risks losing his business when he fronts the money to help thousands of people bring a class action suit against a corrupt bank Benny hurts the case by his attraction to a client and his anxiety over a secret he's keeping from Bull.
A woman claims she witnessed a murder Dimitrius is passed over for supervisor.
Sue discovers her friend has been arrested for armed robbery Bobby's girlfriend receives a job offer.
The team searches for a new designer drug Levi is named "Canine of the Year."
The NCIS team investigates a petty officer's murder that was livestreamed on a popular gaming app Gibbs watches his 11-year-old neighbor when his mom must leave on a last-minute trip.
The NCIS team investigates the murder of a musician in the Navy's most elite band.
While investigating a Marine's murder, the NCIS team uncovers a labyrinth of live-streaming spy cameras hidden in the rooms of a Virginia motel.
A former FBI agent pleads with Gibbs to do whatever is necessary to take down drug dealers after his daughter is hospitalized from an opiate overdose Gibbs is haunted by the personal aspects of the case and his history with vigilante justice.
The team investigates the murder of a Marine sergeant who was hailed as a war hero for his efforts overseas Gibbs turns to Dr. Grace Confalone for advice after he uncharacteristically unravels and abandons his team at a crime scene investigation.
After NCIS finds a secret government bank account that's funding a nationwide network of vigilante justice, the team must determine who is acting as judge and jury.