A young man named Behrouz Nikbakht lives with his mother. He is in love with his cousin Setareh, but Setareh's father intends to marry his daughter to his nephew Ehsan. Behrooz goes to his father's grave to grieve with him. Meanwhile, the police forces arrest a professional killer in Behesht Zahra, but the killer's mobile phone accidentally falls into his hands. The cell phone rings and a man asks Behrooz to kill someone and take his money. The voice behind the phone gives Behrooz the address of a person and Behrooz realizes that a woman named Roya Javaherian is going to be killed. The next day, Behrooz, in order to find out about the murder of this woman, disguises himself as a lawyer and .