S1, E11: Voight (Jason Beghe) and the team discover a massacre, eight million in cash stolen and two wounded men in a clearing house. During questioning, one guy, Perko (guest star Dusan Faeger), provides some intel that is key to the case and leads Antonio (Jon Seda) to realize that two gangs were involved. Burgess (Marina Squerciati) steps up to help the unit and prove herself to Voight. Meanwhile, a softer light is cast on Platt (guest star Amy Morton) when she enlists the help of Ruzek (Patrick Flueger).