Mehdi, an accountant at a contracting company, is in love with Lobat, a cafe singer. Lobat, who is friends with a cunning young man named Hamid, plans to swindle Mehdi. When Mehdi and Ali cash a check for 750,000 Tomans, Taghi, who was formerly Mehdi's friend and classmate, steals the money. Mehdi gives Taghi's details to Lobat, and Lobat, with Hamid's cooperation, kills Taghi. Lobat then turns Mehdi over to the police as the murderer. Lobat also kills Hamid, and she herself is caught by Mehdi, who is cooperating with the police and has been released from prison.