Anthony Ferraris

Severide and Kidd welcome a surprise visitor; Herrmann and Cindy renew their vows; Mouch receives some encouraging news.

A Nuisance Call. Internal issues threaten to derail Engine Company 51.

Always. Boden pulls his team together in the aftermath of the explosion. Casey works to track down Severide. Newhouse brings news about one of Mills' relatives. Herrmann and Otis come up with new goals.

Keep Your Mouth Shut. Despite his frustration, Severide remains hopeful that justice will be served.

Severide is forced to crack open a cold case buried for decades; a routine call hits too close to home for Novak.

Lt. Casey, who is at the center of an undercover operation to bring down a trafficking ring run out of Nesbitt's strip club, finds himself in very dangerous territory. Meanwhile, as a result of the high turnover rate on squad, Severide gets a rude awakening when Capt. Dallas Patterson is brought in.