Alicia represents a stripper who was raped at a stag party and may have previously been abused by her husband. Alicia and her husband Peter discuss whether the children should be allowed to visit him while he's in prison, and Alicia finds incriminating pictures of Peter that her kids had hidden to save her from further pain.
Severide wants to implicate the serial arsonist, Dawson and Shay face the unexpected on a routine call, suspicions indicate Clarke is the mole, and Mouch campaigns for union president.
Lt Severide is targeted by an arsonist, Battalion Chief Boden clashes with Gail McLeod the anniversary of Andy's death, Shay has suspicions, and Mari visits Mouch.
Boden tries to keep the firehouse from closing, the romance between Dawson and Casey grows, Cruz worries for his brother's safety, and Severide and Katie make up for lost time.
Severide tries to prove his suspicions about the arsonist's identity, Casey gets accustomed to his new lifestyle, and Dawson goes on a date with a regular from the bar.