Larisa Polonsky

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.

Sherlock and Watson investigate a child abduction case involving a serial killer known as "The Balloon Man."

Danny and Frank investigate a double murder with a Russian mobster family. Meanwhile, Erin finds herself heading up the most high profile case in town.

Lt Severide is targeted by an arsonist, Battalion Chief Boden clashes with Gail McLeod on the anniversary of Andy's death, Shay has suspicions, and Mari visits Mouch.

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.

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.