Larisa Polonsky

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

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.

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.

The team investigate a nine-year-old psychopath who's been torturing his sister. But when events escalate, Amaro's life is thrown into danger.

In this episode, the Machine flags up a cab driver who is trying to save up enough money to get his family out of his homeland, Cuba. Unfortunately, a 'tip' left in his taxi could cost him his life.

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.