The Intelligence Unit investigates a triad gambling ring; Erin helps Nadia get clean; and Olinski makes Ruzek learn what's it like to be an officer by giving him to Sergeant Platt.
Voight runs into his old partner as he investigates the Triad case. Edwin Stillwell at Internal Affairs has a face to face with Voight, and informs him they're partners now. Stillwell assigns a detective to Voight's unit.
Stillwell catches Voight in the act dealing with Maurice Owens.