Barba and Benson's case involving Noah's biological father threatens Benson and Noah's future.
A little boy is kidnapped from school and a ransom request is made. Detectives soon uncover that the boy knew his abductor, but friction between his parents impedes the investigation. Meanwhile, Benson must take an exam to formalize her promotion.moreless
When a woman recants her testimony which, as a child, helped convict her father, the team reviews the original investigation. However, the assigned judge refuses to grant a new trial, and Bayard Ellis calls on retired Capt. Cragen for assistance.moreless
A Chicago crime resembles a decade-old New York City case, so police from Chicago arrive and team up with the squad to track down a suspect they had to release earlier.
A teen party that became an orgy yields explicit photos that go viral. Barba's focus on prosecuting the student who posted the photographs is sidelined by a cluster of measles cases which are traced back to the same party. As the virus spreads through the city, Benson's son becomes one of the victims, and she looks into the mothers who may have falsified documents in order to enroll their kids into the school system. Elsewhere, Amaro copes with news about his son.moreless
A college student makes a rape accusation in a TV interview, claiming she was gang raped at a fraternity house. Her story casts a national spotlight on sexual assault on college campuses, but her legal case is difficult for Barba to prove.moreless
Carisi's future brother-in-law makes a rape accusation against his female parole officer, forcing Carisi to investigate whether his sister's fiancé is telling the truth or allowing his old bad habits to resurface.
Severide's old friend arrives, hoping for a second chance with the Chicago Fire Department. Meanwhile, Mills tries to regain his active squad status, Mouch confronts his fear about meeting his child, and Brett and Dawson set out to have a big night out.moreless
A famous author whom Carisi idolizes becomes the center of a feud between his wife and two daughters. As evidence mounts against the wife, Carisi takes a personal interest in the case and the man's well-being. Elsewhere, Barba faces his own family conflict when he forces a decision on his abuela.moreless
Scanavino discovers a woman posing as a madam while he is undercover on a trafficking sting. It turns out she's there to track down her daughter, who disappeared three years ago. The team must then balance ethics and necessity as they search for her daughter while closing in on the perpetrator - an unexpectedly familiar face. Elsewhere, Benson gets disturbing news that may affect her son.moreless
There's a new chief at 51 while Chief Boden takes leave, and he brings with him a relieving firefighter who none expects they would every work with. The new chief's methods of leadership are quite different than the crews at 51 are used to ...moreless
Detective Tutuola is drawn into the online gaming world when he investigates the death and rape threats by male gamers against a female developer who is set to launch her new game. When the threats become reality for one of her employees, the team must find the perpetrator before another assault occurs.moreless
Benson and Rollins deal with the fallout after a rape suspect is released due to no evidence and the rape victim's father takes justice into his own hands.