John Seda

Members of Firehouse 51 are less than thrilled when Captain Patterson (guest star Brian White) steps in as replacement for Chief Boden (Eamonn Walker) while he deals with clearing his good name. When Severide (Taylor Kinney) learns of the potential whereabouts of Serena (guest star Ilfenesh Hadera), Chicago P.D's Officer Atwater (LaRoyce Hawkins) and Officer Ruzek (Patrick John Flueger) head to Lake Carlyle to try and uncover additional clues on Boden's case. Meanwhile, Herrmann (David Eigenberg) and Otis (Yuri Sardarov) give Freddie (guest star Ralph Rodriguez) a job that keeps him close by and Jimmy (Steven R. McQueen) and Chili (Dora Madison) elicit more attention then either bargained for, causing some friction between them.

Lt. Casey (Jesse Spencer) and Dawson (Monica Raymund) apply for permanent adoption of Louie, but quickly discover a hurdle. Firefighter turned medical student Jeff Clarke (guests star Jeff Hephner) approaches Lt. Severide (Taylor Kinney) with an interesting proposition. With hopes of reinvigorating business at the bar, Otis convinces a skeptical Herrmann to throw a bash in celebration of the milestone 100th anniversary of Molly's, but not without complications.

Candyman risks his life for Davis. Matty hides from the police. Bobby and Kim get closer. Carlos is upset about Doc's relationship with Morales. Yokas is enraged by Bosco's treatment of a wounded thief.

Walker and the Rangers must protect a deaf girl who has witnessed a mob murder.