Deanna Reed-Foster

The body of a 15 year old girl is found crushed in an abandoned building after she runs away from a treatment center for troubled girls. Voight (Jason Beghe) sends Halstead (Jesse Lee Soffer) undercover as a guard to work from the inside at the center, where he believes the girls are trading sexual favors for something in return. Meanwhile, Platt (Amy Morton) feels guilty because the victim was brought into the District last year, and Platt doesn't remember her.

Tal enlists the help of his colleague to track Kimmer’s whereabouts. Furthering their investigation, Tal and Mariah look to an old friend of The Judge for answers. Back in 2017, The Judge confides in his son, Addison.

Dawson (Monica Raymund) makes an attachment to a young boy she rescues in an apartment blaze while Kidd's (guest star Miranda Rae Mayo) big idea for Molly's turns into a disaster. Lt. Severide (Taylor Kinney) makes a pitch for the house to upgrade some of their fire masks but hits a wall in his efforts, prompting Lt. Casey (Jesse Spencer) to use his political influence to pull a few strings. Meanwhile, Cruz (Joe Minoso) and a reluctant Brett (Kara Killmer) bring in a secret weapon in their efforts to get Otis (Yuri Sardarov) to see Dr. Halstead (guest star Nick Gehlfuss) and take a blood test.

After saving a young girl, Dawson (Monica Raymund) is forced to make a tough decision when she finds out the girl's father is addicted to painkillers. Herrmann (David Eigenberg) loses his cool and gets into an altercation with a police officer after responding to a call. Otis (Yuri Sardarov) and Cruz (Joe Minoso) are on a mission to find out who Brett (Kara Killmer) is dating. Meanwhile, Boden (Eamonn Walker) is skeptical when Donna's (guest star Melissa Ponzio) brother Julian (guest star Michael Cognata) unexpectedly comes to town.

Dawson (Monica Raymund) and Casey (Jesse Spencer) deal with legal matters in hopes of remaining Louie's legal guardians. Severide (Taylor Kinney) continues in his efforts for a bone marrow procedure to help Anna (guest star Charlotte Sullivan), but when things don't go as planned, he finds himself slipping back into old habits. Meanwhile, Brett (Kara Killmer) opens up to Dawson and members of Firehouse 51 become competitive, much to the dismay of Chief Boden (Eamonn Walker).