Guy Burnet

While Severide and Kidd deal with the very real possibility that Kidd's ex may be stalking her, Boden and the other firefighters struggle to handle Borrelli, whose brother's death is causing him to act out.

Casey (Jesse Spencer) and Dawson (Monica Raymund) find themselves unexpectedly caught in the middle of a potential political mess. Stella (Miranda Rae Mayo) is left to make a serious decision about her ex-boyfriend. While responding to an auto accident, members of truck and squad find themselves in the middle of a dangerous situation. Elsewhere, Severide (Taylor Kinney) befriends a famous socialite (guest star Scott Elrod) that might distract him from his duties at 51, while Brett (Kara Killmer) and Mouch (Christian Stolte) set aside their writing differences for the greater good.

Lt. Boden (Eamonn Walker) and Jimmy (Steven R. McQueen) find themselves at odds in dealing with the aftermath of recent events while Kidd (guest star Miranda Rae Mayo) is forced to deal with her unstable and volatile ex, Grant (guest star Guy Burnet). With the help of firehouse 51, Dawson (Monica Raymund) tries to put her best foot forward in her pursuit for fostering Louie. At the urging of Susan Weller (guest star Lauren Stamile), his new political consultant, Casey (Jesse Spencer) tends to his Alderman duties and leaves town with her to attend a three-day summit. Much to his surprise, Casey embraces his new role while Susan urges him to consider grander aspirations. Meanwhile, the house responds to a dangerous structure fire that puts one of their own in a desperate situation.

Casey (Jesse Spencer) continues his run for alderman, but a citywide propaganda attack against his campaign makes him reconsider his candidacy. The rescue squad is summoned to the scene of a man trapped inside of a burning car with suspicious evidence suggesting that the fire may have been intentionally set. Mouch's (Christian Stolte) upcoming bachelor party looms, but with Trudy's (guest star Amy Morton) nerdy brother Larry (guest star Zack Pearlman) handling the details, everyone fears for the worst. Meanwhile, Jimmy (Steven R. McQueen) and Brett (Kara Killmer) take a kidnapping investigation into their own hands.

While responding to a potential carbon monoxide leak inside a home, Lt. Severide (Taylor Kinney) and Cruz (Joe Minoso) uncover the remains of a child inside the chimney. Subsequent information leads Severide to believe that the discovery may be linked to a case he had worked on years ago. Meanwhile, with election day nearing, Casey (Jesse Spencer) braces for the worst in his run for Alderman, prompting Dawson (Monica Raymund) to enlist the firehouse team to lend a hand to the cause. Complicating his chances, Alderman Becks (guest star Armand Schultz) continues to bad mouth Casey to the press, but an incident in the field might prove beneficial.