Enter Argon: A new drug is killing kids and SIU turn the city upside down. Yolanda decides to come clean about her past. Robert Zakia and his partner Miriam, from Internal Affairs, redouble their efforts putting pressure on Jimmy. Jimmy's meeting with Darius results in disastrous consequences. Dead bodies start to mount, and the head of the Albanian Mob, Argon, finds out who killed his son.