With her recent decision to stay on the beat, Burgess begins to feel a little regret. While at a convenience store she sees some suspicious activity and pursues it without calling in for backup. Roman warns against it, but it's too late, they chase the suspect (Chang) into a warehouse and confiscates their guns and radios. They are trapped with no means to communicate out for support. Meanwhile, it's a slow day in intelligence and they are spending the day receiving taser certification.

With a World Trade conference in Chicago, all members of intelligence are undercover in various protest groups to determine potential threats. Ruzek, infiltrates the Black Grid group and befriends Sierra. When she ends up dead intelligence is suspicious of an Argentine Secretary, Fabian Sosa. Voight and Olinsky question Sosa about the death and the team enlists Mouse to help with their tech needs in tracking Sosa. Meanwhile Halstead's brother, Dr. Will Halstead shows up in town for an undetermined amount of time and is already stirring up trouble.