Sammy A. Publes

Tragedy strikes when a rescue attempt at a tenement building proves unsuccessful, leaving the men and women of Firehouse 51 affected by the loss of the victim.

While providing security for a medicinal marijuana dispensary, Halstead and a colleague are targeted by a gang who want to get their hands on the profits.

Intelligence do a deal with Pulpo, the man who kidnapped Antonio's son, in an attempt to get closer to the ruthless boss of a notorious cartel. Ruzek deals with difficult news, Lindsay has a brush with her past and Jin faces a problem.

Tensions run high as Intelligence seeks justice for Olinsky after he's stabbed in prison. Meanwhile, Antonio's loyalty is put to the test, and Woods looks to take down Voight once and for all.