The city is brimming with drug addicts, many of whom are homeless. Samad, a member of Anti-Narcotics Police Task Force, is looking for a drug kingpin, Nasser Khakzad. After several operations, Samad manages to track him down at his penthouse, where he's committed suicide but is still alive.
Nasser goes through legal steps that lead to his death penalty and execution, but along the way, Samad comes to realize that Nasser was drawn to this path because of broken down social conditions, imposed on him. Nasser is ultimately executed, and Samad who has been promoted to the station chief, resigns from his post.
He has come to believe all the arrests and executions in all these years, did not have any effect on society's drug problems. The end result of all the violence has been that the number of addicts has gone from one million to 6.5 million!